Verisk Analytics (VRSK) 10-K 24 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 19, 2016	Jun. 30, 2015
Document Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	VRSK
Entity Registrant Name	Verisk Analytics, Inc.
Entity Central Index Key	1,442,145
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		168,034,463
Entity Public Float			$ 11,382,668,479
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents		$ 138,348	$ 39,359
Available-for-sale securities		3,576	3,801
Accounts receivable, net		320,099	220,668
Prepaid expenses		40,741	31,496
Deferred income taxes, net		0	4,772
Income taxes receivable		48,853	65,512
Other current assets		52,952	18,875
Total current assets		604,569	384,483
Noncurrent assets:
Fixed assets, net		418,168	302,273
Intangible assets, net		1,376,745	406,476
Goodwill	[1]	3,134,826	1,207,146
Pension assets		32,922	18,589
Other assets		48,697	26,363
Total assets		5,615,927	2,345,330
Current liabilities:
Accounts payable and accrued liabilities		245,664	180,726
Short-term debt and current portion of long-term debt		874,811	336,058
Pension and postretirement benefits, current		1,831	1,894
Deferred revenues		356,951	252,592
Total current liabilities		1,479,257	771,270
Noncurrent liabilities:
Long-term debt		2,293,179	1,100,874
Pension benefits		12,971	13,805
Postretirement benefits		1,981	2,410
Deferred income taxes, net		396,430	202,540
Other liabilities		60,098	43,388
Total liabilities		$ 4,243,916	$ 2,134,287
Commitments and contingencies
Stockholders’ equity:
Verisk common stock, $.001 par value; 2,000,000,000 and 1,200,000,000 shares authorized, respectively; 544,003,038 shares issued and 169,424,981 and 157,913,227 shares outstanding, respectively		$ 137	$ 137
Unearned KSOP contributions		0	(161)
Additional paid-in capital		2,023,390	1,171,196
Treasury stock, at cost, 374,578,057 and 386,089,811 shares, respectively		(2,571,190)	(2,533,764)
Retained earnings		2,161,726	1,654,149
Accumulated other comprehensive losses		(242,052)	(80,514)
Total stockholders’ equity		1,372,011	211,043
Total liabilities and stockholders’ equity		$ 5,615,927	$ 2,345,330
[1]	These balances are net of accumulated impairment charges of $3,244 that occurred prior to December 31, 2013.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	2,000,000,000	1,200,000,000
Common stock issued (in shares)	544,003,038	544,003,038
Common stock outstanding (in shares)	169,424,981	157,913,227
Treasury stock (in shares)	374,578,057	386,089,811

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenues	$ 2,068,010	$ 1,746,726	$ 1,595,703
Expenses:
Cost of revenues (exclusive of items shown separately below)	803,274	716,598	622,523
Selling, general and administrative	312,690	227,306	228,982
Depreciation and amortization of fixed assets	120,620	85,506	66,190
Amortization of intangible assets	94,864	56,870	63,741
Total expenses	1,331,448	1,086,280	981,436
Operating income	736,562	660,446	614,267
Other income (expense):
Investment income and others, net	17,003	158	609
Gain on derivative instruments	85,187	0	0
Interest expense	(121,316)	(69,984)	(76,136)
Total other expense, net	(19,126)	(69,826)	(75,527)
Income before income taxes	717,436	590,620	538,740
Provision for income taxes	(209,859)	(219,755)	(196,426)
Income from continuing operations	507,577	370,865	342,314
Income from discontinued operations, net of tax of $0, $25,305 and $4,753, respectively (Note 10)	0	29,177	6,066
Net income	$ 507,577	$ 400,042	$ 348,380
Basic net income per share:
Income from continuing operations (in dollars per share)	$ 3.07	$ 2.24	$ 2.04
Income from discontinued operations (in dollars per share)	0	0.17	0.03
Basic net income per share (in dollars per share)	3.07	2.41	2.07
Diluted net income per share:
Income from continuing operations (in dollars per share)	3.01	2.20	1.99
Income from discontinued operations (in dollars per share)	0	0.17	0.03
Diluted net income per share (in dollars per share)	$ 3.01	$ 2.37	$ 2.02
Weighted average shares outstanding:
Basic (in shares)	165,090,380	165,823,803	168,031,412
Diluted (in shares)	168,451,343	169,132,423	172,276,360

CONSOLIDATED STATEMENTS OF OPE5

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Income from discontinued operations, tax	$ 0	$ 25,305	$ 4,753

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 507,577	$ 400,042	$ 348,380
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(162,742)	(1,286)	(840)
Unrealized holding gain (loss) on available-for-sale securities	113	(35)	(147)
Pension and postretirement adjustment	1,091	(35,705)	46,659
Total other comprehensive (loss) income	(161,538)	(37,026)	45,672
Comprehensive income	$ 346,039	$ 363,016	$ 394,052

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Unearned KSOP Contributions [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Losses [Member]	Securities Financing Transaction, Cost [Member]	Securities Financing Transaction, Cost [Member]Additional Paid-in Capital [Member]	Securities Financing Transaction, Cost [Member]Treasury Stock [Member]
Balance at Dec. 31, 2012	$ 255,591	$ 137	$ (483)	$ 1,044,746	$ (1,605,376)	$ 905,727	$ (89,160)
Balance (in shares) at Dec. 31, 2012	544,003,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 348,380					348,380
Total other comprehensive income (loss)	45,672						45,672
Treasury stock acquired - Class A	(278,938)				(278,938)
KSOP shares earned (47,686 shares reissued from treasury stock)	14,930		177	14,753
Stock options exercised, including tax benefit	137,759			119,236	18,523
Restricted stock lapsed, including tax benefit	991			333	658
Employee stock purchase plan	1,662			1,533	129
Stock based compensation	21,087			21,087
Other stock issuances	455			418	37
Balance at Dec. 31, 2013	$ 547,589	137	(306)	1,202,106	(1,864,967)	1,254,107	(43,488)
Balance (in shares) at Dec. 31, 2013	544,003,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 400,042					400,042
Total other comprehensive income (loss)	(37,026)						(37,026)
Treasury stock acquired - Class A	(775,446)			(100,000)	(675,446)
KSOP shares earned (47,686 shares reissued from treasury stock)	15,351		145	15,206
Stock options exercised, including tax benefit	39,792			34,011	5,781
Restricted stock lapsed, including tax benefit	550			(148)	698
Employee stock purchase plan	1,563			1,414	149
Stock based compensation	20,011			20,011
Net share settlement from restricted stock awards	(1,625)			(1,625)
Other stock issuances	242			221	21
Balance at Dec. 31, 2014	$ 211,043	137	(161)	1,171,196	(2,533,764)	1,654,149	(80,514)
Balance (in shares) at Dec. 31, 2014	544,003,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 507,577					507,577
Total other comprehensive income (loss)	(161,538)						(161,538)
Treasury stock acquired - Class A	(20,456)			100,000	(120,456)
KSOP shares earned (47,686 shares reissued from treasury stock)	14,076		161	13,588	327
Stock options exercised, including tax benefit	69,233			57,503	11,730
Restricted stock lapsed, including tax benefit	1,238			68	1,170
Employee stock purchase plan	1,798			1,625	173
Stock based compensation	30,116			30,116
Net share settlement from restricted stock awards	(2,350)			(2,350)
Other stock issuances	426			386	40			$ 720,848	$ 651,258	$ 69,590
Balance at Dec. 31, 2015	$ 1,372,011	$ 137	$ 0	$ 2,023,390	$ (2,571,190)	$ 2,161,726	$ (242,052)
Balance (in shares) at Dec. 31, 2015	544,003,038

CONSOLIDATED STATEMENTS OF CHA8

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Treasury stock, shares acquired	279,453	10,802,087
Tax benefit of stock options exercised	$ 27,992	$ 15,438	$ 57,065
Shares reissued from treasury stock	1,739,847	1,091,746	4,076,750
Other stock issuances, shares	5,844	3,975	8,109
Number of stock issued during period shares stock options exercised net of taxes	32,882	27,159	0
Stock issued during period, acquisitions (in shares)	10,604,000	0	0
Restricted Stock [Member]
Tax benefit of stock options exercised	$ 1,238	$ 550	$ 991
Shares reissued from treasury stock	177,252	134,713	150,668
Employee Stock Purchase Plan [Member]
Shares reissued from treasury stock	25,599	26,953	27,879
Verisk Class A [Member]
Treasury stock, shares acquired	1,088,474	10,802,087	4,532,552
Ksop [Member]
Shares issued in period	47,686	0	0

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 507,577	$ 400,042	$ 348,380
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of fixed assets	120,620	86,501	70,279
Amortization of intangible assets	94,864	56,982	64,299
Amortization of debt issuance costs and original issue discount	12,899	2,638	2,713
Allowance for doubtful accounts	1,305	1,814	2,482
KSOP compensation expense	14,076	15,351	14,930
Stock based compensation	30,542	20,253	21,087
Gain on derivative instruments	(85,187)	0	0
Gain on sale of subsidiary	0	(65,410)	0
Realized loss (gain) on securities, net	200	(257)	92
Gain on exercise of common stock warrants	(15,602)	0	0
Deferred income taxes	(4,050)	24,491	44,140
Loss on disposal of fixed assets	379	1,048	628
Excess tax benefits from exercised stock options	(40,147)	(22,566)	(109,946)
Loss on extinguishment of convertible note	547	0	0
Other operating activities, net	0	0	448
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(14,609)	(54,515)	2,106
Prepaid expenses and other assets	12,000	(9,625)	(2,386)
Income taxes	51,580	13,760	39,661
Accounts payable and accrued liabilities	(8,832)	12,675	34,022
Deferred revenues	(43,546)	22,114	26,970
Pension and postretirement benefits	(13,704)	(14,802)	(11,392)
Other liabilities	2,775	(1,042)	(41,593)
Net cash provided by operating activities	623,687	489,452	506,920
Cash flows from investing activities:
Acquisitions, net of cash acquired of $40,803, $304 and $0, respectively	(2,858,233)	(35,192)	(983)
Purchase of non-controlling interest in non-public companies	(101)	(5,000)	0
Proceeds from sale of subsidiary	0	151,170	0
Proceeds from extinguishment of convertible note	453	0	0
Escrow funding associated with acquisitions	(83,411)	0	0
Proceeds from release of acquisition related escrows	0	0	280
Proceeds from the settlement of derivative instruments	85,187	0	0
Capital expenditures	(166,138)	(146,818)	(145,976)
Purchases of available-for-sale securities	(165)	(203)	(5,870)
Proceeds from sales and maturities of available-for-sale securities	388	513	7,484
Cash received from the exercise of common stock warrants	15,602	0	0
Other investing activities, net	101	0	(561)
Net cash used in investing activities	(3,006,317)	(35,530)	(145,626)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of original issue discount	1,243,966	0	0
Repayments of current portion of long-term debt	(170,000)	0	(180,000)
Repayments of long-term debt	(50,000)	0	0
Proceeds from issuance of short-term debt with original maturities greater than three months	830,000	0	0
Repayment of short-term debt with original maturities greater than three months	(15,000)	0	0
(Repayments) proceeds from short-term debt, net	(105,000)	160,000	(10,000)
Payment of debt issuance costs	(23,942)	(465)	(605)
Repurchases of common stock	(20,456)	(778,484)	(277,411)
Net share settlement of taxes from restricted stock awards	(2,350)	(1,625)	0
Excess tax benefits from exercised stock options	40,147	22,566	109,946
Proceeds from stock options exercised	38,831	24,648	80,368
Proceeds from issuance of stock as part of a public offering	720,848	0	0
Other financing activities, net	(6,031)	(5,718)	(6,770)
Net cash provided by (used in) financing activities	2,481,013	(579,078)	(284,472)
Effect of exchange rate changes	606	(1,286)	(840)
Increase (decrease) in cash and cash equivalents	98,989	(126,442)	75,982
Cash and cash equivalents, beginning of period	39,359	165,801	89,819
Cash and cash equivalents, end of period	138,348	39,359	165,801
Supplemental disclosures:
Taxes paid	158,494	205,498	126,846
Interest paid	106,098	67,231	75,084
Non-cash investing and financing activities:
Deferred tax liability established on the date of acquisitions	213,048	2,654	1,187
Tenant improvement allowance	1,588	9,134	0
Capital lease obligations	1,720	6,044	10,512
Capital expenditures included in accounts payable and accrued liabilities	2,777	76	5,960
Verisk Class A [Member]
Non-cash investing and financing activities:
Repurchases of common stock included in accounts payable and accrued liabilities	$ 0	$ 0	$ 3,038

CONSOLIDATED STATEMENTS OF CA10

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Net of cash acquired from acquisitions	$ 40,803	$ 304	$ 0

Organization

Organization	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization: Verisk Analytics, Inc. and its consolidated subsidiaries (“Verisk” or the “Company”) enable risk-bearing businesses to better understand and manage their risks. The Company provides its customers proprietary data that, combined with analytic methods, create embedded decision support solutions. The Company is one of the largest aggregators and providers of data pertaining to property and casualty (“P&C”) insurance risks in the United States of America (“U.S.”). The Company offers predictive analytics and decision support solutions to customers in rating, underwriting, claims, catastrophe and weather risk, global risk analytics, natural resources intelligence, economic forecasting, and many other fields. Verisk was established to serve as the parent holding company of Insurance Services Office, Inc. (“ISO”) upon completion of the initial public offering (“IPO”), which occurred on October 9, 2009. ISO was formed in 1971 as an advisory and rating organization for the P&C insurance industry to provide statistical and actuarial services, to develop insurance programs and to assist insurance companies in meeting state regulatory requirements. For over the past decade, the Company broadened its data assets, entered new markets, placed a greater emphasis on analytics, and pursued strategic acquisitions. Verisk trades under the ticker symbol “VRSK” on the NASDAQ Global Select Market.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies: The accompanying consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States of America (“U.S. GAAP”). The preparation of financial statements in conformity with these accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Significant estimates include acquisition purchase price allocations, the fair value of goodwill, the realization of deferred tax assets, acquisition related liabilities, fair value of stock based compensation, assets and liabilities for pension and postretirement benefits, and the estimate for the allowance for doubtful accounts. Actual results may ultimately differ from those estimates. As of December 31, 2013, the Company's mortgage services business qualified as assets held-for-sale. The mortgage services business was sold on March 11, 2014. The results of operations for the Company's mortgage services business are reported as a discontinued operation for the years ended December 31, 2014 and 2013 (See Note 10). Significant accounting policies include the following: (a) Intercompany Accounts and Transactions The consolidated financial statements include the accounts of Verisk. All intercompany accounts and transactions have been eliminated. (b) Revenue Recognition The following describes the Company’s primary types of revenues and the applicable revenue recognition policies. The Company’s revenues are primarily derived from sales of services and revenue is recognized as services are performed and information is delivered to customers. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, fees and/or price is fixed or determinable, and collectability is reasonably assured. Revenue is recognized net of applicable sales tax withholdings. Industry-Standard Insurance Programs Industry-standard insurance programs, statistical agent and data services and actuarial services are sold to participating insurance company customers under annual agreements covering a calendar year where the price is determined at the inception of the agreement. In accordance with Accounting Standards Codification (“ASC”) 605, Revenue Recognition, the Company recognizes revenue ratably over the term of these annual agreements, as services are performed and continuous access to information is provided over the entire term of the agreements. Property-Specific Rating and Underwriting Information The Company provides property-specific rating information through reports issued for specific commercial properties, for which revenue is recognized when the report is delivered to the customer, provided that all other revenue recognition criteria are met. In addition, the Company provides hosting or software solutions that provide continuous access to information about the properties being insured and underwriting information in the form of standard policy forms to be used by customers. As the customer has a contractual right to take possession of the software without significant penalty, revenues from these arrangements are recognized ratably over the contract period from the time when the customer had access to the solution in accordance with ASC 985-605, Software Revenue Recognition (“ASC 985-605”). The Company recognizes software license revenue when the arrangement does not require significant production, customization or modification of the software and the following criteria are met: persuasive evidence of an agreement exists, delivery has occurred, fees are fixed or determinable, and collections are probable. These software arrangements include post-contract customer support (“PCS”). The Company recognizes software license revenue ratably over the duration of the annual license term as vendor specific objective evidence (“VSOE”) of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. Insurance Insurance services primarily consist of term-based software licenses. These software arrangements include PCS, which includes unspecified upgrades on a when-and-if available basis. The Company recognizes software license revenue ratably over the duration of the annual license term as VSOE of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. In certain instances, the customers are billed for access on a monthly basis for the term-based software licenses and the Company recognizes revenue accordingly. There are also services within insurance, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Financial Services Financial services include various types of services to customers. The Company primarily recognizes revenue ratably for these services over the term of the agreements, as services are performed and continuous service is provided over the entire term of the agreements. In addition, there are certain services which are comprised of transaction-based fees; in these instances, revenue is recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Healthcare The Company provides software hosting arrangements to customers whereby the customer does not have the right to take possession of the software. As these arrangements include PCS throughout the hosting term, revenues from these multiple element arrangements are recognized in accordance with ASC 605-25, Revenue Recognition — Multiple Element Arrangements (“ASC 605-25”). The Company recognizes revenue ratably over the duration of the license term, which ranges from one to five years, since the contractual elements do not have stand alone value. There are also services within healthcare, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Energy and Specialized Markets The Company provides hosting solutions that give continuous access to research information such as data analytics and commercial intelligence for the energy, chemicals, metals and mining verticals. For the hosting arrangements, whereby the customer does not have the right to take possession of the software, which include PCS throughout the hosting term, revenues from these multiple element arrangements are recognized in accordance with ASC 605-25. The Company recognizes revenue ratably over the duration of the license term, since the contractual elements do not have stand alone value. Specialized markets consist of term-based software licenses. These software arrangements include PCS, which includes unspecified upgrades on a when-and-if available basis. The Company recognizes software license revenue ratably over the duration of the annual license term as VSOE of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. In certain instances, the customers are billed for access on a monthly basis for the term-based software licenses and the Company recognizes revenue accordingly. In addition, specialized markets are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. The Company services long-term contract arrangements with certain customers. For these arrangements, revenue is recognized in accordance with ASC 605-35, Revenue Recognition — Construction-Type and Production-Type Contracts (“ASC 605-35”), using the percentage-of-completion method, which requires the use of estimates. In such instances, management is required to estimate the input measures, based on hours incurred to date compared to total estimated hours of the project, with consideration also given to output measures, such as contract milestones, when applicable. Adjustments to estimates are made in the period in which the facts requiring such revisions become known. Accordingly, recognized revenues and profits are subject to revisions as the contract progresses to completion. The Company considers the contract substantially complete when there is compliance with all performance specifications and there are no remaining costs or potential risk. There are also services within energy and specialized markets, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. (c) Deferred Revenues The Company invoices its customers in annual, quarterly, monthly or milestone installments. Amounts billed and collected in advance of earnings are recorded as “Deferred revenues” in the accompanying consolidated balance sheets and are recognized as the services are performed and the applicable revenue recognition criteria are met. (d) Fixed Assets and Finite-lived Intangible Assets Property and equipment, internal-use software and finite-lived intangibles are stated at cost less accumulated depreciation and amortization, which are computed on a straight-line basis over their estimated useful lives. Leasehold improvements are amortized over the shorter of the useful life of the asset or the lease term. The Company’s internal software development costs primarily relate to internal-use software. Such costs are capitalized in the application development stage in accordance with ASC 350-40, Internal-use Software . The Company also capitalizes software development costs upon the establishment of technological feasibility for a product in accordance with ASC 985-20, Software to be Sold, Leased, or Marketed (“ASC 985-20”). Software development costs are amortized on a straight-line basis over a three -year period, which management believes represents the useful life of these capitalized costs. In accordance with ASC 360, Property, Plant & Equipment , whenever events or changes in circumstances indicate that the carrying amount of long-lived assets and finite-lived intangible assets may not be recoverable, the Company reviews its long-lived assets and finite-lived intangible assets for impairment by first comparing the carrying value of the assets to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the assets. If the carrying value exceeds the sum of the assets’ undiscounted cash flows, the Company estimates and recognizes an impairment loss by taking the difference between the carrying value and fair value of the assets. (e) Capital and Operating Leases The Company leases various property, plant and equipment. Leased property is accounted for under ASC 840, Leases (“ASC 840”). Accordingly, leased property that meets certain criteria is capitalized and the present value of the related lease payments is recorded as a liability. Amortization of assets accounted for as capital leases is computed utilizing the straight-line method over the shorter of the remaining lease term or the estimated useful life (principally three to four years for computer equipment and automobiles). All other leases are accounted for as operating leases. Rent expense for operating leases, which may have rent escalation provisions or rent holidays, is recorded on a straight-line basis over the non-cancelable lease period in accordance with ASC 840. The initial lease term generally includes the build-out period, where no rent payments are typically due under the terms of the lease. The difference between rent expensed and rent paid is recorded as deferred rent. Construction allowances received from landlords are recorded as a deferred rent credit and amortized to rent expense over the term of the lease. (f) Investments The Company’s investments at December 31, 2015 and 2014 included registered investment companies and equity investments in non-public companies. The Company accounts for short-term investments in accordance with ASC 320, Investments-Debt and Equity Securities (“ASC 320”). There were no investments classified as trading securities at December 31, 2015 or 2014 . All investments with readily determinable market values are classified as available-for-sale. While these investments are not held with the specific intention to sell them, they may be sold to support the Company’s investment strategies. All available-for-sale investments are carried at fair value. The cost of all available-for-sale investments sold is based on the specific identification method, with the exception of mutual fund-based investments, which is based on the weighted average cost method. Dividend income is accrued on the ex-dividend date. The Company performs reviews of its investment portfolio when individual holdings have experienced a decline in fair value below their respective cost. The Company considers a number of factors in the evaluation of whether a decline in value is other-than-temporary including: (a) the financial condition and near term prospects of the issuer; (b) the Company’s ability and intent to retain the investment for a period of time sufficient to allow for an anticipated recovery in value; and (c) the period and degree to which the market value has been below cost. Where the decline is deemed to be other-than-temporary, a charge is recorded to “Investment income and others” in the accompanying consolidated statements of operations, and a new cost basis is established for the investment. The Company’s equity investments in non-public companies are included in “Other assets” in the accompanying consolidated balance sheets. Those securities are carried at cost, as the Company owns less than 20% of the stock and does not otherwise have the ability to exercise significant influence. These securities are written down to their estimated realizable value when management considers there is an other-than-temporary decline in value based on financial information received and the business prospects of the entity. (g) Fair Value of Financial and Non-financial Instruments The Company follows the provisions of ASC 820-10, Fair Value Measurements (“ASC 820-10”), which defines fair value, establishes a framework for measuring fair value under U.S. GAAP and expands fair value measurement disclosures. The Company follows the provisions of ASC 820-10 for its financial assets and liabilities recognized or disclosed at fair value on a recurring basis. The Company follows the provisions of ASC 820-10 for its non-financial assets and liabilities recognized or disclosed at fair value. (h) Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable is generally recorded at the invoiced amount. The allowance for doubtful accounts is estimated based on an analysis of the aging of the accounts receivable, historical write-offs, customer payment patterns, individual customer creditworthiness, current economic trends, and/or establishment of specific reserves for customers in adverse financial condition. The Company assesses the adequacy of the allowance for doubtful accounts on a quarterly basis. (i) Foreign Currency The Company has determined local currencies are the functional currencies of the foreign operations. The assets and liabilities of foreign subsidiaries are translated at the period-end rate of exchange and statement of operations items are translated at the average rates prevailing during the year. The resulting translation adjustment is recorded as a component of “Accumulated other comprehensive losses” in the accompanying consolidated statements of changes in stockholders’ equity. (j) Stock Based Compensation The Company follows ASC 718, Stock Compensation (“ASC 718”). Under ASC 718, stock based compensation cost is measured at the grant date, based on the fair value of the awards granted, and is recognized as expense over the requisite service period. Other equity awards, including restricted stock, are valued at the closing price of the Company’s common stock on the grant date. Restricted stock generally has a service vesting period of four years and the Company recognizes the expense ratably over this service vesting period. The Company estimates expected forfeitures of equity awards at the date of grant and recognizes compensation expense only for those awards expected to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate. Changes in the forfeiture assumptions may impact the total amount of expense ultimately recognized, as well as the timing of expense recognized over the requisite service period. (k) Research and Development Costs Research and development costs, which are primarily related to the personnel and related overhead costs incurred in developing new services for customers, are expensed as incurred. Such costs were $22,737 , $25,508 and $21,426 for the years ended December 31, 2015 , 2014 and 2013 , respectively, and were included in the accompanying consolidated statements of operations. (l) Advertising Costs Advertising costs, which are primarily associated with promoting the Company’s brand, names and solutions provided, are expensed as incurred. Such costs were $7,125 , $6,360 and $8,457 for the years ended December 31, 2015 , 2014 and 2013 , respectively. (m) Income Taxes The Company accounts for income taxes under the asset and liability method under ASC 740, Income Taxes (“ASC 740”), which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Deferred tax assets are recorded to the extent these assets are more likely than not to be realized. In making such determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. Valuation allowances are recognized to reduce deferred tax assets if it is determined to be more likely than not that all or some of the potential deferred tax assets will not be realized. The Company follows ASC 740-10, Income Taxes (“ASC 740-10”) , which clarifies the accounting for uncertainty in income taxes recognized in the financial statements. ASC 740-10 provides that a tax benefit from an uncertain tax position may be recognized based on the technical merits when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes. Income tax positions must meet a more likely than not recognition threshold in accordance with ASC 740-10. This standard also provides guidance on measurement, derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. The Company recognizes interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying consolidated statements of operations. Accrued interest and penalties are included within “Other liabilities” on the accompanying consolidated balance sheets. (n) Earnings Per Share Basic and diluted earnings per share (“EPS”) are determined in accordance with ASC 260, Earnings per Share , which specifies the computation, presentation and disclosure requirements for EPS. Basic EPS excludes all dilutive common stock equivalents. It is based upon the weighted average number of common shares outstanding during the period. Diluted EPS, as calculated using the treasury stock method, reflects the potential dilution that would occur if the Company’s dilutive outstanding stock options and stock awards were issued. (o) Pension and Postretirement Benefits The Company accounts for its pension and postretirement benefits under ASC 715, Compensation — Retirement Benefits (“ASC 715”). ASC 715 requires the recognition of the funded status of a benefit plan in the balance sheet, the recognition in other comprehensive income (loss) of gains or losses and prior service costs or credits arising during the period, but which are not included as components of periodic benefit cost, and the measurement of defined benefit plan assets and obligations as of the balance sheet date. The Company utilizes a valuation date of December 31. (p) Product Warranty Obligations The Company provides warranty coverage for certain of its solutions. The Company recognizes a product warranty obligation when claims are probable and can be reasonably estimated. As of December 31, 2015 and 2014 , product warranty obligations were not material. In the ordinary course of business, the Company enters into numerous agreements that contain standard indemnities whereby the Company indemnifies another party for breaches of confidentiality, infringement of intellectual property or gross negligence. Such indemnifications are primarily granted under licensing of computer software. Most agreements contain provisions to limit the maximum potential amount of future payments that the Company could be required to make under these indemnifications; however, the Company is not able to develop an estimate of the maximum potential amount of future payments to be made under these indemnifications as the triggering events are not subject to predictability. (q) Loss Contingencies The Company accrues for costs relating to litigation, claims and other contingent matters when such liabilities become probable and reasonably estimable. Such estimates are based on management’s judgment. Actual amounts paid may differ from amounts estimated, and such differences will be charged to operations in the period in which the final determination of the liability is made. (r) Goodwill Goodwill represents the excess of acquisition costs over the fair value of tangible net assets and identifiable intangible assets of the businesses acquired. Goodwill and intangible assets deemed to have indefinite lives are not amortized. Intangible assets determined to have finite lives are amortized over their useful lives. Goodwill and intangible assets with indefinite lives are subject to impairment testing annually as of June 30 or whenever events or changes in circumstances indicate that the carrying amount may not be fully recoverable. The Company completed the required annual impairment test as of June 30, 2015 , which resulted in no impairment of goodwill in 2015 . This test compares the carrying value of each reporting unit to its fair value. If the fair value of the reporting unit exceeds the carrying value of the net assets, including goodwill assigned to that reporting unit, goodwill is not impaired. If the carrying value of the reporting unit’s net assets, including goodwill, exceeds the fair value of the reporting unit, then the Company will determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss is recorded for the difference between the carrying amount and the implied fair value of the goodwill. (s) Recent Accounting Pronouncements In April 2015, the Financial Accounting Standard Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU No. 2015-03"). The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company has elected not to early adopt. The adoption of ASU No. 2015-03 is not expected to have a material impact on the Company's consolidated financial statements. In April 2015, the FASB issued ASU 2015-05, Customer's Accounting for Fees Paid in a Cloud Computing Arrangement ("ASU No. 2015-05"). This guidance is intended to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement, primarily to determine whether the arrangement includes a sale or license of software. ASU No. 2015-05 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. The Company has elected to adopt ASU No. 2015-05 in 2016. The adoption of ASU No. 2015-05 is not expected to have a material impact on the Company's consolidated financial statements. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date ("ASU No. 2015-14"). The amendments in this update defer the effective date of ASU No. 2014-09, Revenue from Contracts with Customers ("ASU No. 2015-09"), for all entities by one year. Public business entities will apply the guidance in ASU No. 2015-09 for annual reporting periods beginning after December 15, 2017. The Company is currently evaluating ASU No. 2015-09 and has not determined the impact this standard may have on its financial statements nor decided upon the method of adoption. In August 2015, the FASB issued ASU No. 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements ("ASU No. 2015-15"). ASU No. 2015-15 clarifies that ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs , does not address the presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. As a result, an entity may present debt issuance costs related to line-of-credit arrangements as an asset instead of as a direct deduction from the carrying amount of the debt. The Company has elected not to early adopt ASU No. 2015-15. The adoption of ASU No. 2015-15 is not expected to have a material impact on the Company's consolidated financial statements. In September 2015, the FASB issued ASU No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments ("ASU No. 2015-16"). ASU No. 2015-16 requires, for business combinations, that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU No. 2015-16 is effective for fiscal years beginning after December 15, 2015. Early adoption is permitted for reporting periods for which financial statements have not been issued. The Company has elected to early adopt ASU No. 2015-16 on a prospective basis. Adoption of this guidance did not have a material impact on the results of operations or financial position (see Note 9). In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes ("ASU No. 2015-17"). This ASU requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position. The Company early adopted ASU No. 2015-17 effective December 31, 2015 on a prospective basis. Adoption of this ASU resulted in a reclassification of the net current deferred tax asset to the net non-current deferred tax asset in the accompanying consolidated balance sheet as of December 31, 2015. No prior periods were retrospectively adjusted. The Company applied this guidance to its current fiscal year ending December 31, 2015. Adoption of this guidance did not have a material impact on the results of operations or financial position (see Note 12).

Concentration of Credit Risk

Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk: Financial instruments that potentially expose the Company to credit risk consist primarily of cash and cash equivalents, available for sale securities and accounts receivable, which are generally not collateralized. The Company maintains its cash and cash equivalents in higher credit quality financial institutions in order to limit the amount of credit exposure. The total domestic cash balances are insured by the Federal Deposit Insurance Corporation (“FDIC”) to a maximum amount of $250 per bank at December 31, 2015 and 2014 . At December 31, 2015 and 2014 , the Company had cash balances on deposit that exceeded the balance insured by the FDIC limit by approximately $85,000 and $16,316 with six banks. At December 31, 2015 and 2014 , the Company also had cash on deposit with foreign banks of approximately $52,092 and $21,886 , respectively. The Company considers the concentration of credit risk associated with its trade accounts receivable to be commercially reasonable and believes that such concentration does not result in the significant risk of near-term severe adverse impacts. The Company’s top fifty customers represent approximately 36% of revenues for 2015 , 41% for 2014 and 38% for 2013 with no individual customer accounting for more than 2% of revenues during the year ended December 31, 2015 , and 5% for 2014 and 3% for 2013 . No individual customer comprised more than 3% of accounts receivable at December 31, 2015 and 7% at December 31, 2014 .

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents consist of cash in banks, commercial paper, money-market funds, and other liquid instruments with original maturities of 90 days or less at the time of purchase.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Accounts Receivable	Accounts Receivable: Accounts receivable consisted of the following at December 31: 2015 2014 Billed receivables $ 283,509 $ 203,339 Unbilled receivables 41,660 23,324 Total receivables 325,169 226,663 Less allowance for doubtful accounts (5,070 ) (5,995 ) Accounts receivable, net $ 320,099 $ 220,668

Investments

Investments	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	Investments: Available-for-sale securities consisted of the following: Adjusted Cost Gross Unrealized Loss Fair Value December 31, 2015 Registered investment companies $ 3,622 $ (46 ) $ 3,576 December 31, 2014 Registered investment companies $ 4,045 $ (244 ) $ 3,801 In addition to the available-for-sale securities above, the Company has equity investments in non-public companies in which the Company acquired non-controlling interests and for which no readily determinable market value exists. These securities were accounted for under the cost method in accordance with ASC 323-10-25, The Equity Method of Accounting for Investments in Common Stock . At December 31, 2015 and 2014 , the carrying value of such securities was $8,487 , and has been included in “Other assets” in the accompanying consolidated balance sheets. Realized gain (loss) on securities, net, including write downs related to other-than-temporary impairments of available-for-sale securities and other assets, has been included in "Investment income and others" in the accompanying consolidated statements of operations. Realized gain (loss) on securities, net, was as follows for the years ended December 31: 2015 2014 2013 Gross realized gain on sale of securities $ 15,718 $ 285 $ 966 Other-than-temporary impairment of securities (316 ) (28 ) (84 ) Other-than-temporary impairment of non-controlling interest in non-public companies — — (974 ) Realized gain (loss) on securities, net $ 15,402 $ 257 $ (92 )

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements: Certain assets and liabilities of the Company are reported at fair value in the accompanying consolidated balance sheets. Such assets and liabilities include amounts for both financial and non-financial instruments. To increase consistency and comparability of assets and liabilities recorded at fair value, ASC 820-10 establishes a three-level fair value hierarchy to prioritize the inputs to valuation techniques used to measure fair value. ASC 820-10 requires disclosures detailing the extent to which companies’ measure assets and liabilities at fair value, the methods and assumptions used to measure fair value and the effect of fair value measurements on earnings. In accordance with ASC 820-10, the Company applied the following fair value hierarchy: Level 1 — Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments. Level 2 — Assets and liabilities valued based on observable market data for similar instruments. Level 3 — Assets or liabilities for which significant valuation assumptions are not readily observable in the market; instruments valued based on the best available data, some of which is internally-developed, and considers risk premiums that a market participant would require. The following table provides information for such assets and liabilities as of December 31, 2015 and 2014 . The fair values of cash and cash equivalents (other than money-market funds which are recorded on a reported net asset value basis disclosed below), accounts receivable, accounts payable and accrued liabilities, deferred revenues, Business Combinations (“ASC 805”), short-term debt, and short-term debt expected to be refinanced approximate their carrying amounts because of the short-term nature of these instruments. The following table summarizes fair value measurements by level for cash equivalents and registered investment companies that were measured at fair value on a recurring basis: Total Quoted Prices Significant December 31, 2015 Registered investment companies(1) $ 3,576 $ 3,576 $ — December 31, 2014 Cash equivalents – money-market funds $ 3,707 $ — $ 3,707 Registered investment companies(1) $ 3,801 $ 3,801 $ — (1) Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned. The Company has not elected to carry its long-term debt at fair value. The carrying value of the long-term debt represents amortized cost. The Company assesses the fair value of its long-term debt based on quoted market prices if available, and if not, an estimate of interest rates available to the Company for debt with similar features, the Company’s current credit rating and spreads applicable to the Company. The fair value of the long-term debt would be a Level 2 liability if the long-term debt was measured at fair value on the consolidated balance sheets. The following table summarizes the carrying value and estimated fair value of the long-term debt as of December 31, 2015 and 2014 respectively: 2015 2014 Carrying Estimated Carrying Estimated Financial instrument not carried at fair value: Long-term debt excluding capitalized leases $ 2,290,862 $ 2,328,134 $ 1,265,848 $ 1,371,213

Fixed Assets

Fixed Assets	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Fixed Assets	Fixed Assets The following is a summary of fixed assets: Useful Life Cost Accumulated Net December 31, 2015 Furniture and office equipment 3-10 years $ 250,673 $ (167,148 ) $ 83,525 Leasehold improvements Lease term 71,061 (30,104 ) 40,957 Purchased software 3 years 130,760 (99,820 ) 30,940 Software development costs 3 years 410,872 (152,204 ) 258,668 Leased equipment 3-4 years 33,098 (29,020 ) 4,078 Total fixed assets $ 896,464 $ (478,296 ) $ 418,168 December 31, 2014 Furniture and office equipment 3-10 years $ 199,199 $ (131,055 ) $ 68,144 Leasehold improvements Lease term 65,212 (27,884 ) 37,328 Purchased software 3 years 116,089 (80,794 ) 35,295 Software development costs 3 years 266,559 (111,766 ) 154,793 Leased equipment 3-4 years 32,776 (26,063 ) 6,713 Total fixed assets $ 679,835 $ (377,562 ) $ 302,273 Depreciation and amortization of fixed assets for the years ended December 31, 2015 , 2014 and 2013 were $120,620 , $85,506 and $66,190 , of which $34,842 , $19,000 and $12,806 related to amortization of internal-use software development costs, respectively. Amortization expense related to development of software for sale in accordance with ASC 985-20 was $9,228 , $4,497 and $3,623 for the years ended December 31, 2015 , 2014 and 2013 , respectively. The Company had unamortized software development costs that had been capitalized in accordance with ASC 985-20 of $94,733 , $34,749 and $29,149 as of December 31, 2015 , 2014 and 2013 , respectively. Leased equipment includes amounts held under capital leases for automobiles, computer software and computer equipment.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions 2015 Acquisitions On May 19, 2015, the Company acquired 100 percent of the stock of Wood Mackenzie Limited ("Wood Mackenzie") for a net cash purchase price of $2,889,629 , including $78,694 of an indemnity escrow, which the Company financed through a combination of debt and equity offerings, borrowings under the Company's new credit facility, and cash on hand. Due to the fact that a portion of the purchase price was funded in pounds sterling and the remainder in U.S. dollars, the Company entered into a foreign currency hedging instrument to purchase pounds sterling. The Company recorded a gain on the hedge of $85,187 within "Gain on derivative instruments" in the accompanying consolidated statements of operations. The proceeds from the gain were utilized to partially fund the acquisition of Wood Mackenzie. Wood Mackenzie is a global provider of data analytics and commercial intelligence for the energy, chemicals, metals and mining verticals. This acquisition advances the Company’s strategy to expand internationally and positions the Company in the global energy market. Wood Mackenzie is included in the energy and specialized markets vertical, formerly named the specialized markets vertical, of the Decision Analytics segment. On November 6, 2015, the Company acquired 100 percent of the stock of Infield Systems Limited ("Infield"). Infield is a provider of business intelligence, analysis, and research to the oil, gas, and associated marine industries. Infield has become part of Wood Mackenzie and continues to provide services to enhance Wood Mackenzie's upstream and supply chain capabilities in the Decision Analytics segment. The Company paid a net cash purchase price of $13,804 . The preliminary purchase price allocation of the acquisition is presented as “Others” in the table below. On November 20, 2015, the Company acquired 100 percent of the stock of The PCI Group ("PCI"). PCI is a consortium of five specialist companies that offer integrated data and subscriptions research in the chemicals, fibers, films, and plastics sectors. PCI has become part of Wood Mackenzie, a Verisk Analytics business, and continues to provide services to enhance Wood Mackenzie's chemicals capabilities in the Decision Analytics segment. The Company paid a net cash purchase price of $37,387 . The preliminary purchase price allocation of the acquisition is presented as “Others” in the table below. The preliminary purchase price allocations of the acquisitions resulted in the following: Wood Mackenzie Others Total Cash and cash equivalents $ 35,398 $ 5,405 $ 40,803 Accounts receivable 80,825 1,954 82,779 Current assets 97,505 419 97,924 Fixed assets 71,929 267 72,196 Intangible assets 1,111,950 22,172 1,134,122 Goodwill 1,994,018 36,328 2,030,346 Other assets 2,007 5,022 7,029 Total assets acquired 3,393,632 71,567 3,465,199 Current liabilities 110,000 3,437 113,437 Deferred revenues 142,457 2,801 145,258 Deferred income taxes, net 209,032 4,016 213,048 Other liabilities 7,116 4,717 11,833 Total liabilities assumed 468,605 14,971 483,576 Net assets acquired 2,925,027 56,596 2,981,623 Less: Cash acquired 35,398 5,405 40,803 Net cash purchase price $ 2,889,629 $ 51,191 $ 2,940,820 The preliminary allocations of the purchase price above are subject to revisions as additional information is obtained about the facts and circumstances that existed as of the acquisition date. The revisions may have a significant impact on the consolidated financial statements. During the year ended December 31, 2015 , the Company revised the preliminary allocation of purchase price and estimated valuation of intangible assets by recording a decrease to intangible assets of $182,994 , a decrease in deferred tax liabilities of $49,944 , a decrease in other items of $3,871 , and an increase to goodwill of $136,921 . These adjustments have been reflected in the above preliminary allocations of the purchase price. The impact of all adjustments have been reflected in the consolidated financial statements as of and for the year ended December 31, 2015 . The allocations of the purchase price will be finalized once all information is obtained, but not to exceed one year from the acquisition date. The primary areas of the purchase price allocation that are not yet finalized relate to fixed assets and operating leases, income and non-income taxes, deferred revenues, the valuation of intangible assets acquired, and residual goodwill. The Company determined the estimated fair values of the assets and liabilities of Wood Mackenzie with the assistance of valuations performed by third party specialists, discounted cash flow analysis and estimates made by management. The preliminary amounts assigned to intangible assets by type for all other acquisitions were based upon the Company's valuation model and historical experiences with entities with similar business characteristics. The preliminary amounts by type for the Wood Mackenzie acquisition are summarized in the table below: Weighted Total Technology-based 7 years $ 104,663 Marketing-related 20 years 232,935 Customer-related 15 years 278,106 Database-related 20 years 496,246 Total intangible assets $ 1,111,950 The goodwill associated with the stock purchases of PCI, Infield and Wood Mackenzie is not deductible for tax purposes. For the year ended December 31, 2015 , the Company incurred transaction costs related to these acquisitions of $27,637 included within "Selling, general and administrative" expenses and $13,336 included within "Interest expense" in the accompanying consolidated statements of operations. Supplemental information on an unaudited pro forma basis is presented below as if the acquisition of Wood Mackenzie occurred at the beginning of 2014. The pro forma information for the year ended December 31, 2015 and 2014 presented below is based on estimates and assumptions, which the Company believes to be reasonable but not necessarily indicative of the consolidated financial position or results of operations in future periods or the results that actually would have been realized had this acquisition been completed at the beginning of 2014. The unaudited pro forma information includes intangible asset amortization charges and incremental borrowing costs as a result of the acquisition, net of related tax, estimated using the Company’s effective tax rate for continuing operations for the periods presented. 2015 2014 (unaudited) Pro forma revenues $ 2,207,724 $ 2,121,241 Pro forma income from continuing operations $ 507,416 $ 425,397 Pro forma basic income from continuing operations per share $ 3.07 $ 2.57 Pro forma diluted income from continuing operations per share $ 3.01 $ 2.52 2014 Acquisition On December 8, 2014, the Company acquired 100% of the stock of Maplecroft.Net Limited (“Maplecroft”), a provider of global risk analytics and advisory services, for a net cash purchase price of $30,141 , which includes $2,725 of indemnity escrows held by the seller. Using a proprietary data aggregation and analytical approach, Maplecroft enables its customers to assess, monitor, and forecast a growing range of worldwide risks, including geopolitical and societal risks. Within the Company's Decision Analytics segment, this acquisition establishes the Company's position as a provider of value chain optimization tools, providing comprehensive quantitative risk analytics and platforms by which customers can visualize, quantify, mitigate, and manage risk. The preliminary purchase price allocation of the acquisition resulted in the following: Maplecroft Accounts receivable $ 1,833 Current assets 543 Fixed assets 98 Intangible assets 13,270 Goodwill 21,369 Total assets acquired 37,113 Current liabilities 4,318 Deferred income taxes, net 2,654 Total liabilities assumed 6,972 Net assets acquired $ 30,141 The preliminary amounts assigned to intangible assets by type for the acquisition are summarized in the table below: Weighted Total Technology-based 10 years $ 3,202 Marketing-related 10 years 458 Customer-related 10 years 9,610 Total intangible assets 10 years $ 13,270 The goodwill associated with the stock purchase of Maplecroft is not deductible for tax purposes. For the year ended December 31, 2014, the Company incurred transaction costs related to this acquisition of $349 included within “Selling, general and administrative” expenses in the accompanying consolidated statements of operations. In accordance with ASC 805, the allocation of the purchase price for Maplecroft was revised during the measurement period. Refer to Note 11. Goodwill and Intangible Assets for further discussion. Acquisition Escrows Pursuant to the related acquisition agreements, the Company has funded various escrow accounts to satisfy pre-acquisition indemnity and tax claims arising subsequent to the acquisition dates, as well as a portion of the contingent payments. During the year ended December 31, 2015 , the Company released $5,144 and $37,005 of indemnity escrows related to the MediConnect Global, Inc. acquisition and the Wood Mackenzie acquisition, respectively. At December 31, 2015 and 2014 , the current portion of the escrows amounted to $38,690 and $5,583 , and the noncurrent portion of the escrows amounted to $4,591 and $0 , respectively. The current and noncurrent portions of the escrows have been included in “Other current assets” and "Other assets" in the accompanying consolidated balance sheets, respectively.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations: On March 11, 2014, the Company sold 100% of the stock of the Company’s mortgage services business, Interthinx, which was a guarantor subsidiary, in exchange for a purchase price of $151,170 . At the completion of the sale, Interthinx ceased being a guarantor. The cash received was adjusted subsequent to close to reflect final balances of certain working capital accounts and other closing adjustments. The Company recognized income from discontinued operations, net of tax, of $29,177 during 2014. Results of operations for the mortgage services business are reported as a discontinued operation for the year ended December 31, 2014 and for all prior periods presented. The mortgage services business met the criteria for being reported as a discontinued operation and has been segregated from continuing operations. The following table summarizes the results from the discontinued operation for the years ended December 31: 2014 2013 Revenues from discontinued operations $ 11,512 $ 109,151 Income from discontinued operations before income taxes (including gain on sale of $65,410 in 2014) 54,482 10,819 Provision for income taxes (including tax on the gain on sale in 2014) (25,305 ) (4,753 ) Income from discontinued operations, net of tax $ 29,177 $ 6,066

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets: Goodwill represents the excess of acquisition costs over the fair value of tangible net assets and identifiable intangible assets of the businesses acquired. Goodwill and intangible assets deemed to have indefinite lives are not amortized. Intangible assets determined to have finite lives are amortized over their useful lives. The Company completed the required annual impairment test as of June 30, 2015 , 2014 and 2013 , which resulted in no impairment of goodwill. Based on the results of the impairment assessment as of June 30, 2015 , the Company determined that the fair value of its reporting units exceeded their respective carrying value. There were no goodwill impairment indicators after the date of the last annual impairment test. The following is a summary of the change in goodwill from December 31, 2013 through December 31, 2015 , both in total and as allocated to the Company’s operating segments: Risk Decision Total Goodwill at December 31, 2013 (1) $ 55,555 $ 1,126,126 $ 1,181,681 Current year acquisitions — 22,740 22,740 Acquisition related escrow funding — 2,725 2,725 Goodwill at December 31, 2014 (1) 55,555 1,151,591 1,207,146 Current year acquisitions — 2,030,346 2,030,346 Purchase accounting reclassifications — 1,589 1,589 Foreign currency translation adjustment — (104,255 ) (104,255 ) Goodwill at December 31, 2015 (1) $ 55,555 $ 3,079,271 $ 3,134,826 (1) These balances are net of accumulated impairment charges of $3,244 that occurred prior to December 31, 2013 . During the year ended December 31, 2015 , the Company finalized the purchase accounting for the acquisition of Maplecroft, which resulted in an increase in goodwill of $1,589 , an increase in fixed assets of $355 , an increase in current liabilities of $163 , an increase in other liabilities of $288 , a decrease in intangible assets of $2,494 , and a decrease in deferred income taxes, net of $1,001 . The impact of the finalization of the purchase accounting for these acquisitions was not material to the consolidated statements of operations for the years ended December 31, 2015 and 2014 . The Company’s intangible assets and related accumulated amortization consisted of the following: Weighted Cost Accumulated Net December 31, 2015 Technology-based 8 years $ 417,884 $ (219,975 ) $ 197,909 Marketing-related 16 years 292,012 (66,214 ) 225,798 Contract-based 6 years 6,555 (6,555 ) — Customer-related 13 years 653,223 (155,804 ) 497,419 Database-based 20 years 470,367 (14,748 ) 455,619 Total intangible assets $ 1,840,041 $ (463,296 ) $ 1,376,745 December 31, 2014 Technology-based 8 years $ 299,705 $ (195,698 ) $ 104,007 Marketing-related 5 years 71,504 (54,745 ) 16,759 Contract-based 6 years 6,555 (6,555 ) — Customer-related 13 years 399,011 (113,301 ) 285,710 Total intangible assets $ 776,775 $ (370,299 ) $ 406,476 Amortization expense related to intangible assets for the years ended December 31, 2015 , 2014 and 2013 , was approximately $94,864 , $56,870 , and $63,741 , respectively. Estimated amortization expense in future periods through 2021 and thereafter for intangible assets subject to amortization is as follows: Year Amount 2016 $ 120,523 2017 119,616 2018 118,870 2019 117,410 2020 115,955 2021 and thereafter 784,371 Total $ 1,376,745

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: Domestic and foreign income from continuing operations before income taxes was as follows: 2015 2014 2013 U.S. $ 605,777 $ 584,658 $ 532,933 Foreign 111,659 5,962 5,807 Total income from continuing operations $ 717,436 $ 590,620 $ 538,740 The components of the provision for income taxes from continuing operations for the years ended December 31 were as follows: 2015 2014 2013 Current: Federal $ 181,536 $ 167,683 $ 134,014 State and local 25,565 26,333 18,764 Foreign 3,414 1,470 1,201 Total current provision for income taxes 210,515 195,486 153,979 Deferred: Federal 21,969 27,220 37,894 State and local 1,671 (2,740 ) 4,287 Foreign (24,296 ) (211 ) 266 Total deferred provision for income taxes (656 ) 24,269 42,447 Provision for income taxes $ 209,859 $ 219,755 $ 196,426 The reconciliation between the Company’s effective tax rate on income from continuing operations and the statutory tax rate is as follows for the years ended December 31: 2015 2014 2013 Federal statutory rate 35.0 % 35.0 % 35.0 % State and local taxes, net of federal tax benefit 2.6 % 2.7 % 2.6 % Foreign tax differentials (6.5 )% (0.1 )% (0.1 )% UK legislative change (2.0 )% — % — % Other 0.2 % (0.4 )% (1.0 )% Effective tax rate for continuing operations 29.3 % 37.2 % 36.5 % The decrease in the effective tax rate in 2015 compared to 2014 was due to tax benefits related to the Wood Mackenzie acquisition and a U.K. legislative rate reduction. The tax effects of significant items comprising the Company’s deferred tax assets as of December 31 are as follows: 2015 2014 Deferred income tax asset: Employee wages, pension and other benefits $ 26,086 $ 29,756 Deferred revenue — 1,835 Deferred rent 6,935 5,463 Net operating loss carryover 2,593 4,292 State tax adjustments 4,334 2,472 Capital and other unrealized losses 3,358 3,255 Other 11,193 4,956 Total 54,499 52,029 Less valuation allowance (873 ) (789 ) Deferred income tax asset 53,626 51,240 Deferred income tax liability: Fixed assets and intangible assets (443,990 ) (242,857 ) Other (6,066 ) (6,151 ) Deferred income tax liability (450,056 ) (249,008 ) Deferred income tax liability, net $ (396,430 ) $ (197,768 ) During November 2015, the FASB issued ASU No. 2015-17, which simplifies the presentation of deferred income taxes. This ASU requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position. The Company early adopted ASU No. 2015-17 effective December 31, 2015 on a prospective basis. Adoption of this ASU resulted in a reclassification of the net current deferred tax asset to the net non-current deferred tax asset in the accompanying consolidated balance sheet as of December 31, 2015. No prior periods were retrospectively adjusted. The Company applied this guidance to its current fiscal year ended December 31, 2015. Adoption of this guidance had no material impact on the results of operations or financial position. The net deferred income liability of $396,430 consists primarily of timing differences involving depreciation and amortization. The ultimate realization of the deferred tax assets depends on the Company’s ability to generate sufficient taxable income in the future. The Company has provided for a valuation allowance against the deferred tax assets associated with the net operating losses of certain subsidiaries. The Company’s net operating loss carryforwards expire as follows: Years Amount 2016-2023 $ 3,428 2024-2028 12,418 2029-2035 40,720 Total $ 56,566 A valuation allowance has been established based on the Company’s evaluation of the likelihood of utilizing these benefits before they expire. The Company has determined that the generation of future taxable income from certain subsidiaries to fully realize the deferred tax assets is uncertain. Other than these items, the Company has determined, based on the Company’s historical operating performance, that taxable income of the Company will more likely than not be sufficient to fully realize the deferred tax assets. It is the practice of the Company to permanently reinvest the undistributed earnings of its foreign subsidiaries in those operations. As of December 31, 2015 , the Company has not made a provision for U.S. or additional foreign withholdings taxes on approximately $102,837 of the unremitted earnings. The Company does not rely on these unremitted earnings as a source of funds for its domestic business as it expects to have sufficient cash flow in the U.S. to fund its U.S. operational and strategic needs. Consequently, the Company has not provided for U.S. federal or state income taxes or associated withholding taxes on these undistributed foreign earnings. The Company follows ASC No. 740-10, which prescribes a comprehensive model for the financial statement recognition, measurement, presentation and disclosure of uncertain tax positions taken or expected to be taken in income tax returns. For each tax position, the Company must determine whether it is more likely than not that the position will be sustained upon examination based on the technical merits of the position, including resolution of any related appeals or litigation. A tax position that meets the more likely than not recognition threshold is then measured to determine the amount of benefit to recognize within the financial statements. No benefits may be recognized for tax positions that do not meet the more likely than not threshold. A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows: 2015 2014 2013 Unrecognized tax benefit at January 1 $ 10,637 $ 9,524 $ 17,883 Gross increase in tax positions in prior period 7,137 2,679 541 Gross decrease in tax positions in prior period (2,666 ) — (4,241 ) Gross increase in tax positions from stock acquisitions — — — Settlements (285 ) — (390 ) Lapse of statute of limitations (348 ) (1,566 ) (4,269 ) Unrecognized tax benefit at December 31 $ 14,475 $ 10,637 $ 9,524 Of the total unrecognized tax benefits at December 31, 2015 , 2014 and 2013 , $11,444 , $5,771 and $4,658 , respectively, represent the amounts that, if recognized, would have a favorable effect on the Company’s effective tax rate in any future periods. The total gross amount of accrued interest and penalties at December 31, 2015 , 2014 and 2013 was $2,815 , $2,818 and $2,619 , respectively. The Company’s practice is to recognize interest and penalties associated with income taxes as a component of “Provision for income taxes” in the accompanying consolidated statements of operations. The Company does not expect a significant increase in unrecognized benefits related to federal, foreign, or state tax exposures within the coming year. In addition, the Company believes that it is reasonably possible that approximately $472 of its currently remaining unrecognized tax positions, each of which is individually insignificant, may be recognized by the end of 2016 as a result of a combination of audit settlements and lapses of statute of limitations, net of additional uncertain tax positions. The Company is subject to tax in the U.S. and in various state and foreign jurisdictions. The Company joined by its domestic subsidiaries, files a consolidated income tax return for the Federal income tax purposes. With few exceptions, none of which are material to the Company’s consolidated financial statements at December 31, 2015, the Company is no longer subject to U.S. federal, state, and local or non-US income tax examinations by tax authorities for tax years before 2011. The Internal Revenue Service is conducting an audit for Mediconnect for the year ended March 30, 2012, with a statute extension until December 31, 2016. In New Jersey, the Company is being audited for the years ended December 31, 2007 through 2013. The Company is also under audit in New York for the years ended December 31, 2010 through 2012 with a statue extension until July 29, 2016. The Company is also under audit in Illinois for the years ended December 31, 2012 through 2013. The Company does not expect that the results of these examinations will have a material effect on its financial position, results of operations or cash flow.

Composition of Certain Financia

Composition of Certain Financial Statement Captions	12 Months Ended
	Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Composition of Certain Financial Statement Captions	Composition of Certain Financial Statement Captions: The following table presents the components of “Other current assets”, “Accounts payable and accrued liabilities” and “Other liabilities” as of December 31: 2015 2014 Other current assets: Acquisition related escrows $ 38,690 $ 5,583 Other current assets 14,262 13,292 Total other current assets $ 52,952 $ 18,875 Accounts payable and accrued liabilities: Accrued salaries, benefits and other related costs $ 101,259 $ 87,729 Escrow liabilities 38,632 5,565 Trade accounts payable and other accrued expenses 105,773 87,432 Total accounts payable and accrued liabilities $ 245,664 $ 180,726 Other liabilities: Unrecognized tax benefits, including interest and penalty $ 17,290 $ 13,455 Deferred rent 33,093 22,386 Other liabilities 9,715 7,547 Total other liabilities $ 60,098 $ 43,388

Debt

Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Debt	Debt: The following table presents short-term and long-term debt by issuance as of December 31: Issuance Date Maturity Date 2015 2014 Short-term debt and current portion of long-term debt: Syndicated revolving credit facility Various Various $ 870,000 $ 160,000 Prudential shelf notes: 5.84% Series H shelf notes 10/26/2007 10/26/2015 — 17,500 6.28% Series I shelf notes 4/29/2008 4/29/2015 — 85,000 New York Life shelf notes: 5.87% Series A shelf notes 10/26/2007 10/26/2015 — 17,500 6.35% Series B shelf notes 4/29/2008 4/29/2015 — 50,000 Capital lease obligations Various Various 4,811 6,058 Short-term debt and current portion of long-term debt 874,811 336,058 Long-term debt: Senior notes: 4.000% senior notes, less unamortized discount of $4,532 and $0, respectively 5/15/2015 6/15/2025 895,468 — 5.500% senior notes, less unamortized discount of $1,175 and $0, respectively 5/15/2015 6/15/2045 348,825 — 4.125% senior notes, less unamortized discount of $1,860 and $2,137, respectively 9/12/2012 9/12/2022 348,140 347,863 4.875% senior notes, less unamortized discount of $1,023 and $1,361, respectively 12/8/2011 1/15/2019 248,977 248,639 5.80% senior notes, less unamortized discount of $548 and $654, respectively 4/6/2011 5/1/2021 449,452 449,346 Prudential shelf notes: 6.85% Series J shelf notes 6/15/2009 6/15/2016 — 50,000 Capital lease obligations Various Various 2,317 5,026 Long-term debt 2,293,179 1,100,874 Total debt $ 3,167,990 $ 1,436,932 Accrued interest associated with the Company’s outstanding debt obligations was $18,584 and $16,265 as of December 31, 2015 and 2014 , respectively, and included in “Accounts payable and accrued liabilities” within the accompanying consolidated balance sheets. Interest expense associated with the Company’s outstanding debt obligations was $121,316 , $69,984 and $76,136 for the years ended December 31, 2015 , 2014 and 2013 , respectively. Senior Notes On May 15, 2015, the Company completed issuances of senior notes in aggregate principal amounts of $900,000 and $350,000 due on June 15, 2025 and June 15, 2045, respectively, that accrue interest at a rate of 4.000% and 5.500% , respectively. Interest is payable semiannually on both series of senior notes on June 15th and December 15th of each year, beginning on December 15, 2015. The senior notes were issued at a discount of $4,833 and $1,201 , respectively, and the Company incurred debt issuance costs on the senior notes of $7,560 and $4,138 , respectively. The discount and debt issuance costs were recorded in "Long-term debt" and "Other assets," respectively, in the accompanying consolidated balance sheets and these costs will be amortized to "Interest expense" in the accompanying consolidated statements of operations over the life of the respective senior note. The net proceeds from the issuance of these notes was utilized to partially fund the acquisition of Wood Mackenzie. The indenture governing the senior notes restricts the Company's ability to, among other things, create certain liens, enter into sale/leaseback transactions and consolidate with, sell, lease, convey or otherwise transfer all or substantially all of the Company's assets, or merge with or into, any other person or entity. As of December 31, 2015 and 2014 , the Company had senior notes with an aggregate principal amount of $2,300,000 and $1,050,000 outstanding, respectively. On April 22, 2015, the Company signed an agreement to enter into a $1,750,000 committed senior unsecured Syndicated Revolving Credit Facility (the "new Credit Facility") with Bank of America N.A., JP Morgan Chase, N.A., Sun Trust Bank, Wells Fargo Bank N.A., Citizens Bank, N.A., Morgan Stanley Senior Funding, Inc., HSBC Bank USA, N.A., Royal Bank of Canada, BNP Paribas, TD Bank, N.A., The Northern Trust Company, and Capital One N.A. The new Credit Facility became effective on May 15, 2015. The new Credit Facility has a single borrower, Verisk Analytics, Inc,. and there are no guarantor subsidiaries of the debt. In accordance with the indenture governing our senior notes, the guarantor subsidiaries of the senior notes were automatically released as they were no longer guarantor subsidiaries under the new Credit Facility. On July 24, 2015, the Company entered into the First Amendment to the new Credit Facility which modified the definitions of Consolidated EBIT and Consolidated EBITDA to permit the adding back of certain non-recurring expenses related to the acquisition of Wood Mackenzie. The Company utilized borrowings of $930,000 from the new Credit Facility to partially fund the purchase of Wood Mackenzie. The new Credit Facility may also be used for general corporate purposes, including working capital needs and capital expenditures, acquisitions and the share repurchase program (the "Repurchase Program"). The new Credit Facility has replaced the previously existing $990,000 Syndicated Revolving Credit Facility (the "old Credit Facility"). The new Credit Facility contains certain financial and other covenants that, among other things, impose certain restrictions on indebtedness, liens, investments, and capital expenditures. These covenants also place restrictions on mergers, asset sales, sale/leaseback transactions, payments between the Company and its subsidiaries, and certain transactions with affiliates. The financial covenants require that, at the end of any fiscal quarter, the Company have a consolidated interest coverage ratio of at least 3.0 to 1.0 and that it maintains, during any period of four fiscal quarters, a consolidated funded debt leverage ratio of 3.75 to 1.0, which ratio steps down to 3.5 to 1.0 at the end of the fourth fiscal quarter ending after the consummation of the acquisition of Wood Mackenzie. The Company was in compliance with all financial covenants under the new Credit Facility as of December 31, 2015 . Interest on borrowings under the new Credit Facility is payable at an interest rate of LIBOR plus 1.125% to 1.625% , depending upon the consolidated funded debt leverage ratio. A commitment fee on any unused balance is payable periodically and may range from 12.50 to 25.00 basis points based upon the consolidated funded debt leverage ratio. As of December 31, 2015 and 2014 , the Company had outstanding borrowings under the new Credit Facility and old Credit Facility of $870,000 and $160,000 , respectively. In January and February 2016, the Company repaid a total of $165,000 of the $870,000 outstanding borrowings at December 31, 2015 under the new Credit Facility. As of December 31, 2015 , the Company no longer has any outstanding private placement debt. On April 29, 2015, the Company repaid $85,000 and $50,000 of private placement debt with Prudential Capital Group and New York Life, respectively, that came due utilizing $55,000 from cash from on hand and $80,000 from borrowings under the Credit Facility. On May 14, 2015, the Company prepaid the remaining private placement debt with New York Life of $17,500 , which had been due on October 26, 2015, and $17,500 and $50,000 of remaining private placement debt with Prudential, which was due on October 26, 2015, and June 15, 2016, respectively. To prepay this debt, the Company utilized $25,000 of cash on hand and borrowings from its old Credit Facility of $60,000 . The contractual costs for the prepayment of this debt was $4,786 and was recorded to "Interest expense" in the accompanying consolidated statements of operations for the year ended December 31, 2015 . On March 10, 2015, in connection with the Company's agreement to acquire Wood Mackenzie, the Company entered into a commitment letter for a $2,300,000 364 -day bridge financing arrangement with Bank of America N.A. and Morgan Stanley Bank N.A. acting as joint lead arrangers. This financing arrangement was only to be utilized in the event the Company did not complete the debt and equity offerings relating to its acquisition of Wood Mackenzie by a certain date, and was terminated upon the closing of the acquisition. See Note 9. The Company paid fees associated with this financing arrangement of $ 9,100 . Due to the completion of the debt and equity offerings, this arrangement was terminated and the full $ 9,100 of fees were recorded to "Interest expense" in the accompanying consolidated statements of operations for the year ended December 31, 2015 . The Company was in compliance with all financial covenants at December 31, 2015 and 2014 . Debt Maturities The following table reflects the Company’s debt maturities: Year Amount 2016 $ 874,811 2017 1,411 2018 618 2019 250,210 2020 48 2021 and thereafter 2,050,030 Total $ 3,177,128

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity: The Company has 2,000,000,000 and 1,200,000,000 shares of authorized common stock as of December 31, 2015 and 2014 , respectively. The common shares have rights to any dividend declared by the board of directors, subject to any preferential or other rights of any outstanding preferred stock, and voting rights to elect all twelve members of the board of directors. The Company has 80,000,000 shares of authorized preferred stock, par value $0.001 per share. The preferred shares have preferential rights over the common shares with respect to dividends and net distribution upon liquidation. The Company did not issue any preferred shares as of December 31, 2015 . Equity Offering The Company completed an equity offering of its common stock on May 12, 2015 in order to finance the acquisition of Wood Mackenzie. The Company received total proceeds of $721,867 , net of underwriting discount of $20,413 , from the offering of 10,604,000 treasury shares at a net public offering price of $68.075 per share. In conjunction with the offering, the Company incurred $1,019 of costs related to the issuance of the common stock. The proceeds from the offering, net of underwriting discount and related issuance costs, was recorded as a decrease to treasury shares at the weighted average price of the Company's treasury shares, with the remainder of the net proceeds recorded as an increase to additional paid in capital in the accompanying condensed consolidated balance sheets and condensed consolidated statements of changes in stockholders' equity. Share Repurchase Program Since May 2010, the Company has authorized repurchases of up to $2,300,000 of its common stock through its Repurchase Program, including the additional authorization of $300,000 announced on December 1, 2015. Since the introduction of share repurchase as a feature of the Company's capital management strategies in 2010, the Company has repurchased shares with an aggregate value of $1,830,649 . As of December 31, 2015 , the Company had $469,351 available to repurchase shares. The Company has no obligation to repurchase stock under this program and intends to use this authorization as a means of offsetting dilution from the issuance of shares under the ISO 401(k) Savings and Employee Stock Ownership Plan ("KSOP"), the Verisk 2013 Equity Incentive Plan (the "2013 Incentive Plan"), the Verisk 2009 Equity Incentive Plan (the “2009 Incentive Plan”), and the ISO 1996 Incentive Plan (the “1996 Incentive Plan”), while providing flexibility to repurchase additional shares if warranted. This authorization has no expiration date and may be increased, reduced, suspended, or terminated at any time. Shares that are repurchased under the Repurchase Program will be recorded as treasury stock and will be available for future issuance. In December 2014, the Company entered into an accelerated share repurchase program ("ASR") to repurchase shares of its common stock for an aggregate purchase price of $500,000 . Upon payment of the aggregate purchase price in December 2014, the Company received an initial delivery of 6,372,472 shares of the Company's common stock. Upon final settlement of the ASR agreement in June 2015, the Company received an additional 809,021 shares of the Company's common stock. These repurchases of 7,181,493 shares resulted in a reduction of the outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share ("EPS"). During the years ended December 31, 2015 and 2014 , the Company repurchased 279,453 and 10,802,087 shares of common stock as part of the Repurchase Program at a weighted average price of $73.20 and $62.53 per share, respectively. The Company utilized cash from operations and borrowings from its Credit Facility to fund these repurchases. Treasury Stock As of December 31, 2015 , the Company’s treasury stock consisted of 374,578,057 shares of common stock. During the years ended December 31, 2015 and 2014 , the Company reissued 12,600,228 and 1,257,387 shares of common stock, under the 2013 Incentive Plan, 2009 Incentive Plan and the 1996 Incentive Plan, from the treasury shares at a weighted average price of $6.59 and $5.29 per share, respectively. Earnings Per Share Basic EPS is computed by dividing income from continuing operations, income from discontinued operations and net income, respectively, by the weighted average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding, using the treasury stock method, if the dilutive potential common shares, including stock options, nonvested restricted stock, nonvested restricted stock units, and the impact from the ASR program, had been issued. The following is a reconciliation of the numerators and denominators of the basic and diluted EPS computations for the years ended December 31: 2015 2014 2013 (In thousands, except for share and per share data) Numerator used in basic and diluted EPS: Income from continuing operations $ 507,577 $ 370,865 $ 342,314 Income from discontinued operations — 29,177 6,066 Net income $ 507,577 $ 400,042 $ 348,380 Denominator: Weighted average number of common shares used in basic EPS 165,090,380 165,823,803 168,031,412 Effect of dilutive shares: Potential common stock issuable from stock options and stock awards 3,360,963 3,308,620 4,244,948 Weighted average number of common shares and dilutive potential common shares used in diluted EPS 168,451,343 169,132,423 172,276,360 The potential shares of common stock that were excluded from diluted EPS were 1,221,301 , 1,633,670 and 656,499 at December 31, 2015 , 2014 and 2013 , respectively, because the effect of including those potential shares was anti-dilutive. Accumulated Other Comprehensive Losses The following is a summary of accumulated other comprehensive losses as of December 31: 2015 2014 Foreign currency translation adjustment $ (165,828 ) $ (3,086 ) Unrealized gains (losses) on available-for-sale securities, net of tax 3 (110 ) Pension and postretirement adjustment, net of tax (76,227 ) (77,318 ) Accumulated other comprehensive losses $ (242,052 ) $ (80,514 ) The before tax and after tax amounts of other comprehensive income for the years ended December 31, 2015 , 2014 and 2013 are summarized below: Before Tax Tax Benefit After Tax December 31, 2015 Foreign currency translation adjustment $ (162,742 ) $ — $ (162,742 ) Unrealized holding gain on available-for-sale securities before reclassifications 398 (162 ) 236 Amount reclassified from accumulated other comprehensive losses (1) (200 ) 77 (123 ) Unrealized holding gain on available-for-sale securities 198 (85 ) 113 Pension and postretirement adjustment before reclassifications 5,197 (2,105 ) 3,092 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (3,242 ) 1,241 (2,001 ) Pension and postretirement adjustment 1,955 (864 ) 1,091 Total other comprehensive loss $ (160,589 ) $ (949 ) $ (161,538 ) December 31, 2014 Foreign currency translation adjustment $ (1,286 ) $ — $ (1,286 ) Unrealized holding loss on available-for-sale securities before reclassifications (314 ) 121 (193 ) Amount reclassified from accumulated other comprehensive losses (1) 257 (99 ) 158 Unrealized holding loss on available-for-sale securities (57 ) 22 (35 ) Pension and postretirement adjustment before reclassifications (56,635 ) 21,629 (35,006 ) Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (1,134 ) 435 (699 ) Pension and postretirement adjustment (57,769 ) 22,064 (35,705 ) Total other comprehensive loss $ (59,112 ) $ 22,086 $ (37,026 ) December 31, 2013 Foreign currency translation adjustment $ (840 ) $ — $ (840 ) Unrealized holding loss on available-for-sale securities before reclassifications (1,122 ) 433 (689 ) Amount reclassified from accumulated other comprehensive losses (1) 882 (340 ) 542 Unrealized holding loss on available-for-sale securities (240 ) 93 (147 ) Pension and postretirement adjustment before reclassifications 80,773 (30,611 ) 50,162 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (5,699 ) 2,196 (3,503 ) Pension and postretirement adjustment 75,074 (28,415 ) 46,659 Total other comprehensive income $ 73,994 $ (28,322 ) $ 45,672 (1) This accumulated other comprehensive losses component, before tax, is included under “Investment income and others” in the accompanying consolidated statements of operations. (2) This accumulated other comprehensive losses component, before tax, is included under “Cost of revenues” and “Selling, general and administrative” in the accompanying consolidated statements of operations. This component is also included in the computation of net periodic benefit (credit) cost (see Note 17 Pension and Postretirement Benefits for additional details).

Compensation Plans

Compensation Plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation Plans	Compensation Plans: KSOP The Company has established the KSOP for the benefit of eligible employees in the U.S. and Puerto Rico. The KSOP includes both an employee savings component and an employee stock ownership component. The purpose of the combined plan is to enable the Company’s employees to participate in a tax-deferred savings arrangement under Internal Revenue Service Code Sections 401(a) and 401(k) (the “Code”), and to provide employee equity participation in the Company through the employee stock ownership plan (“ESOP”) accounts. Under the KSOP, eligible employees may make pre-tax and after-tax cash contributions as a percentage of their compensation, subject to certain limitations under the applicable provisions of the Code. The maximum pre-tax contribution that can be made to the 401(k) account as determined under the provisions of Code Section 401(g) is $18 , $18 and $18 for 2015 , 2014 and 2013 , respectively. Certain eligible participants (age 50 and older) may contribute an additional $6 on a pre-tax basis for 2015 , 2014 and 2013 . After-tax contributions are limited to 10% of a participant’s compensation. The quarterly matching contributions are primarily equal to 75% of the first 6% of the participant’s contribution. The Company established the ESOP component as a funding vehicle for the KSOP. The common shares acquired by the KSOP were pledged as collateral under an intercompany loan agreement ("ESOP loan") between the KSOP and Company. The Company made quarterly cash contributions to the KSOP equal to the KSOP’s debt service. As the debt was repaid, shares were released from collateral and are used to fund the quarterly 401(k) matching and profit sharing contributions before being allocated to active employees in proportion to their annual salaries in relation to total participant salaries. The Company accounted for its ESOP in accordance with ASC 718-40, Employee Stock Ownership Plans (“ASC 718-40”) and ASC 480-10, Distinguishing Liabilities from Equity (“ASC 480-10”). As shares were committed to be released from collateral, the Company reported compensation expense at the then-current fair value of the shares, and the shares become outstanding for EPS computations. As of December 31, 2015 , the KSOP no longer has any outstanding ESOP loan balance with the Company. The Company issued 47,686 shares of common stock at a weighted average per price of $77.51 to fund quarterly matching contributions for the year ended December 31, 2015 . In accordance with the ESOP loan, the Company is also required to contribute a total of $17,000 , plus interest, of cash or shares to the KSOP by the end of 2016. Earlier contribution is at the Company's discretion. As of December 31, 2015 , the Company had no allocated ESOP shares. For the years ended December 31, 2015 , 2014 and 2013 , there were no ESOP contributions. In 2005, the Company established the ISO Profit Sharing Plan (the “Profit Sharing Plan”), a defined contribution plan, to replace the qualified pension plan for all eligible employees hired on or after March 1, 2005. The Profit Sharing Plan is a component of the KSOP. Eligible employees participated in the Profit Sharing Plan if they completed 1,000 hours of service each plan year and were employed on December 31 of that year. The Company can make a discretionary contribution to the Profit Sharing Plan based on the annual performance of the Company. Participants vest once they have completed four years and 1,000 hours of service. For the years ended December 31, 2015 , 2014 and 2013 , there were no profit sharing contributions. At December 31, 2015 , 2014 and 2013 , the fair value of Verisk common stock was $76.88 , $64.05 , and $65.72 per share, respectively. KSOP compensation expense for 2015 , 2014 and 2013 was approximately $14,076 , $15,351 and $14,930 , respectively. Equity Compensation Plans All of the Company’s outstanding stock options and restricted stock are covered under the 2013 Incentive Plan, 2009 Incentive Plan or the 1996 Incentive Plan. Awards under the 2013 Incentive Plan may include one or more of the following types: (i) stock options (both nonqualified and incentive stock options), (ii) stock appreciation rights, (iii) restricted stock, (iv) restricted stock units, (v) performance awards, (vi) other share-based awards, and (vii) cash. Employees, directors and consultants are eligible for awards under the 2013 Incentive Plan. The Company issued common stock under these plans from the Company's treasury shares. On May 15, 2013, the Company’s shareholders approved the 2013 Incentive Plan. The number of shares of common stock available for issuance under the 2013 Incentive Plan is 15,700,000 and such amount shall be reduced on a 1 -for-1 basis for every share issued that is subject to an option or stock appreciation right and on a 2.5 -for-1 basis for every share issued that is subject to an award other than an option or stock appreciation right. Shares that were subject to an award under the 2013 Incentive Plan that become forfeited, expired or otherwise terminated shall again be available for issuance under the 2013 Incentive Plan on a 1 -for-1 basis if the shares were subject to options or stock appreciation rights, and on an 2.5 -for-1 basis if the shares were subject to awards other than options or stock appreciation rights. As of December 31, 2015 , there were 10,351,157 shares of common stock reserved and available for future issuance. Cash received from stock option exercises for the years ended December 31, 2015 , 2014 and 2013 was $38,831 , $24,648 and $80,368 , respectively. The Company has granted equity awards to key employees and directors. The nonqualified stock options have an exercise price equal to the closing price of the Company’s common stock on the grant date, with a ten -year contractual term. The fair value of the restricted stock is determined using the closing price of the Company's common stock on the grant date. The restricted stock is not assignable or transferable until it becomes vested. The Company recognizes the expense of the equity awards over the vesting period. A summary of the equity awards granted for the year ended December 31, 2015 is presented below. Grant Date Service Vesting Period Stock Options Restricted Stock Common Stock April 1, 2015 Four-year graded vesting 1,177,191 211,756 — April 1, 2015 Not applicable — — 840 May 19, 2015 Immediate vesting on grant date 255,473 52,960 — May 19, 2015 Four-year graded vesting 225,363 42,064 — May 19, 2015 Four-year cliff vesting 127,931 28,445 — July 1, 2015 Immediate vesting on grant date 27,047 1,131 — July 1, 2015 One-year cliff vesting 51,876 9,988 — July 1, 2015 Not applicable — — 3,873 July 1, 2015 Four-year graded vesting 2,244 418 — July 8, 2015 Four-year graded vesting 3,778 692 — July 13, 2015 Four-year graded vesting 1,304 244 — August 3, 2015 Four-year graded vesting 927 173 — August 10, 2015 Four-year graded vesting 1,776 335 — August 24, 2015 Four-year graded vesting 3,737 691 — November 9, 2015 Four-year graded vesting 5,615 1,107 — 1,884,262 350,004 4,713 The fair value of the stock options granted was estimated on the date of grant using a Black-Scholes option valuation model that uses the weighted-average assumptions noted in the following table during the years ended December 31: 2015 2014 2013 Expected volatility 19.51 % 20.53 % 29.27 % Risk-free interest rate 1.29 % 1.48 % 0.70 % Expected term in years 4.5 4.4 4.5 Dividend yield — % — % — % Weighted average grant date fair value per stock option $ 13.58 $ 11.86 $ 15.58 The expected term for a majority of the awards granted was estimated based on studies of historical experience and projected exercise behavior. However, for certain awards granted, for which no historical exercise pattern exists, the expected term was estimated using the simplified method. The risk-free interest rate is based on the yield of U.S. Treasury zero coupon securities with a maturity equal to the expected term of the equity award. The volatility factor is calculated using historical daily closing prices over the most recent period that is commensurate with the expected term of the stock option awards. The volatility factor for stock options granted prior to 2014 was based on the average volatility of the Company's peers as the Company did not have a history of stock price sufficient to cover the expected term of those awards. The volatility factor for stock options granted in 2014 and 2015 was based on the volatility of the Company's stock. The expected dividend yield was based on the Company’s expected annual dividend rate on the date of grant. A summary of options outstanding under the Incentive Plan and the Option Plan and changes during the three years then ended is presented below: Number Weighted Aggregate (In thousands, except for share and per share data) Outstanding at January 1, 2013 12,573,298 $ 22.21 $ 361,653 Granted 888,038 $ 61.10 Exercised (4,076,750 ) $ 19.79 $ 168,056 Cancelled or expired (149,266 ) $ 43.14 Outstanding at December 31, 2013 9,235,320 $ 26.67 $ 360,611 Granted 1,242,428 $ 59.83 Exercised (1,091,746 ) $ 22.29 $ 43,863 Cancelled or expired (180,312 ) $ 55.23 Outstanding at December 31, 2014 9,205,690 $ 31.11 $ 303,267 Granted 1,884,262 $ 72.20 Exercised (1,739,847 ) $ 23.71 $ 87,008 Cancelled or expired (232,372 ) $ 64.05 Outstanding at December 31, 2015 9,117,733 $ 40.17 $ 334,691 Options exercisable at December 31, 2015 6,541,229 $ 29.81 $ 307,924 Options exercisable at December 31, 2014 7,159,895 $ 24.00 $ 286,728 A summary of the status of the Company’s nonvested options and changes is presented below: Number Weighted Nonvested balance at January 1, 2013 3,776,302 $ 9.43 Granted 888,038 $ 15.58 Vested (2,448,843 ) $ 8.81 Cancelled or expired (149,266 ) $ 12.18 Nonvested balance at December 31, 2013 2,066,231 $ 12.61 Granted 1,242,428 $ 11.86 Vested (1,082,552 ) $ 11.71 Cancelled or expired (180,312 ) $ 13.56 Nonvested balance at December 31, 2014 2,045,795 $ 12.55 Granted 1,884,262 $ 13.58 Vested (1,121,181 ) $ 13.24 Cancelled or expired (232,372 ) $ 13.05 Nonvested balance at December 31, 2015 2,576,504 $ 12.95 Intrinsic value for stock options is calculated based on the exercise price of the underlying awards and the quoted price of Verisk’s common stock as of the reporting date. The aggregate intrinsic value of stock options outstanding and exercisable at December 31, 2015 was $334,691 and $307,924 , respectively. In accordance with ASC 718, excess tax benefit from exercised stock options is recorded as an increase to additional-paid-in capital and a corresponding reduction in taxes payable. This tax benefit is calculated as the excess of the intrinsic value of options exercised in excess of compensation recognized for financial reporting purposes. The amount of the tax benefit that has been realized, as a result of those excess tax benefits, is presented as a financing cash inflow within the accompanying consolidated statements of cash flows. For the years ended December 31, 2015 , 2014 and 2013 , the Company recorded excess tax benefit from exercised stock options of $29,230 , $15,988 and $58,056 , respectively. The Company realized $40,147 , $22,566 and $109,946 of tax benefit within the Company’s tax payments through December 31, 2015 , 2014 and 2013 , respectively.The Company estimates expected forfeitures of equity awards at the date of grant and recognizes compensation expense only for those awards that the Company expects to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate. Changes in the forfeiture assumptions may impact the total amount of expense ultimately recognized over the requisite service period and may impact the timing of expense recognized over the requisite service period. Stock based compensation expense for 2015 , 2014 and 2013 was $30,542 , $20,253 and $21,087 , respectively. A summary of the status of the restricted stock awarded under the 2013 Incentive Plan and changes is presented below: Number Weighted Outstanding at January 1, 2013 331,013 $ 42.78 Granted 241,674 $ 61.12 Vested (150,668 ) $ 37.82 Forfeited (25,270 ) $ 53.00 Outstanding at December 31, 2013 396,749 $ 52.82 Granted 246,003 $ 59.86 Vested (163,280 ) $ 49.94 Forfeited (37,162 ) $ 55.53 Outstanding at December 31, 2014 442,310 $ 56.84 Granted 350,004 $ 72.24 Vested (211,265 ) $ 58.64 Forfeited (47,281 ) $ 63.10 Outstanding at December 31, 2015 533,768 $ 66.25 For the year ended December 31, 2015 , certain employees had restricted stock vesting and covered the aggregate statutory minimum tax withholding of $2,350 through a net settlement of 32,882 shares. The payment of taxes related to the vesting was recorded as a reduction to additional paid-in-capital. This transaction is reflected within "Net share settlement of restricted stock awards" within cash flows from financing activities in the accompanying consolidated statements of cash flows. As of December 31, 2015 , there was $53,536 of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the 2013 Incentive Plan and the 2009 Incentive Plan. That cost is expected to be recognized over a weighted-average period of 2.66 years. As of December 31, 2015 , there were 2,576,504 and 531,278 nonvested stock options and restricted stock, respectively, of which 2,125,711 and 441,089 are expected to vest. The total grant date fair value of options vested during the years ended December 31, 2015 , 2014 and 2013 was $16,780 , $12,780 and $16,468 , respectively. The total grant date fair value of restricted stock vested during the year ended December 31, 2015 , 2014 and 2013 was $16,316 , $9,839 and $7,153 , respectively. The Company also offers eligible employees the opportunity to participate in an employee stock purchase plan ("ESPP"). Under the ESPP, participating employees may authorize payroll deductions of up to 20.0% of their regular base salary and up to 50.0% of their short-term incentive compensation, both of which in total may not exceed $25 in any calendar year, to purchase shares of the Company’s common stock at a 5.0% discount of its fair market value at the time of purchase. In accordance with ASC 718, the ESPP is noncompensatory as the purchase discount is 5.0% or less from the fair market value, substantially all employees that meet limited employment qualifications may participate, and it incorporates no option features. During the years ended December 31, 2015 , 2014 and 2013 , the Company issued 25,599 , 26,953 and 27,879 shares of common stock at a weighted average discounted price of $70.27 , $57.98 and $59.62 , respectively.

Pension and Postretirement Bene

Pension and Postretirement Benefits	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Pension and Postretirement Benefits	Pension and Postretirement Benefits: The Company maintained a qualified defined benefit pension plan for certain of its employees through membership in the Pension Plan for Insurance Organizations (the “Pension Plan”), a multiple-employer trust. The Company applied a cash balance formula to determine future benefits. Under the cash balance formula, each participant has an account, which is credited annually based on salary rates determined by years of service, as well as the interest earned on the previous year-end cash balance. The Company also has a non-qualified supplemental cash balance plan (“SERP”) for certain employees. The SERP is funded from the general assets of the Company. Effective February 29, 2012, the Company instituted a hard freeze, which eliminated all future compensation and service credits, to all participants in the Pension Plan and SERP. In 2015 , the Pension Plan and the SERP had a plan amendment due to the adoption of the updated mortality table. The Pension Plan’s funding policy is to contribute annually at an amount between the minimum funding requirements set forth in the Employee Retirement Income Security Act of 1974 and the maximum amount that can be deducted for federal income tax purposes. In April 2012, the Company completed a voluntary prefunding to the Pension Plan of $72,000 . Due to the prefunding, the minimum contribution requirement was and is expected to be $0 in 2015 and 2016 , respectively. The Company contributed $970 and $1,177 to the SERP in 2015 and 2014 , respectively, and expects to contribute $971 in 2016 . The Company also provides certain healthcare and life insurance benefits for both active and retired employees. The Postretirement Health and Life Insurance Plan (the “Postretirement Plan”), which has been frozen, is contributory, requiring participants to pay a stated percentage of the premium for coverage. The Company expects to contribute $879 to the Postretirement Plan in 2016 . The following table sets forth the changes in the benefit obligations and the plan assets, the (funded) unfunded status of the Pension Plan, SERP and Postretirement Plan, and the amounts recognized in the Company’s consolidated balance sheets at December 31: Pension Plan and SERP Postretirement Plan 2015 2014 2015 2014 Change in benefit obligation: Benefit obligation at January 1 $ 471,259 $ 420,664 $ 18,773 $ 20,399 Interest cost 18,102 19,073 520 593 Actuarial loss (gain) (44,159 ) 61,804 (1,584 ) (411 ) Plan amendments 3,830 — — — Plan participants’ contributions — — 1,903 2,635 Benefits paid (29,406 ) (30,282 ) (4,464 ) (4,834 ) Federal subsidy on benefits paid — — 739 391 Benefit obligation at December 31 $ 419,626 $ 471,259 $ 15,887 $ 18,773 Accumulated benefit obligation at December 31 $ 419,626 $ 471,259 Change in plan assets: Fair value of plan assets at January 1 $ 475,281 $ 467,912 $ 15,231 $ 16,601 Actual return on plan assets, net of expenses (8,220 ) 36,474 14 743 Employer contributions, net 970 1,177 (396 ) (305 ) Plan participants’ contributions — — 1,903 2,635 Benefits paid (29,406 ) (30,282 ) (4,464 ) (4,834 ) Subsidies received — — 739 391 Fair value of plan assets at December 31 $ 438,625 $ 475,281 $ 13,027 $ 15,231 (Funded) unfunded status at December 31 $ (18,999 ) $ (4,022 ) $ 2,860 $ 3,542 Amounts recognized in the consolidated balance sheets consist of: Pension assets, noncurrent $ (32,922 ) $ (18,589 ) $ — $ — Pension, SERP and postretirement benefits, current 952 762 879 1,132 Pension, SERP and postretirement benefits, noncurrent 12,971 13,805 1,981 2,410 Total Pension, SERP and Postretirement benefits $ (18,999 ) $ (4,022 ) $ 2,860 $ 3,542 The pre-tax components included within accumulated other comprehensive losses as of December 31 are summarized below: Pension Plan and SERP Postretirement Plan 2015 2014 2015 2014 Prior service benefit $ 3,830 $ — $ (854 ) $ (1,000 ) Actuarial losses 116,400 120,735 6,725 8,321 Accumulated other comprehensive losses, pretax $ 120,230 $ 120,735 $ 5,871 $ 7,321 The pre-tax components of net periodic benefit (credit) cost and the amounts recognized in other comprehensive loss (income) are summarized below for the years ended December 31: Pension Plan and SERP Postretirement Plan 2015 2014 2013 2015 2014 2013 Interest cost $ 18,102 $ 19,073 $ 17,860 $ 520 $ 593 $ 608 Expected return on plan assets (34,432 ) (33,942 ) (30,480 ) (563 ) (786 ) (919 ) Amortization of prior service benefit — — — (146 ) (146 ) (146 ) Amortization of net actuarial loss 2,828 763 5,078 560 517 767 Net periodic benefit (credit) cost (13,502 ) (14,106 ) (7,542 ) 371 178 310 Amortization of actuarial loss reclassified from accumulated other comprehensive losses (174 ) (354 ) (1,320 ) — — — Amortization of prior service benefit reclassified from accumulated other comprehensive losses — — — 146 146 146 Net loss recognized reclassified from accumulated other comprehensive losses (2,653 ) (409 ) (3,758 ) — — — Plan amendments 3,830 — — — — — Actuarial gain (loss) (1,508 ) 59,272 (70,065 ) (1,596 ) (886 ) (77 ) Total recognized in other comprehensive loss (income) (505 ) 58,509 (75,143 ) (1,450 ) (740 ) 69 Total recognized in net periodic benefit (credit) cost and other comprehensive loss (income) $ (14,007 ) $ 44,403 $ (82,685 ) $ (1,079 ) $ (562 ) $ 379 The estimated amounts in accumulated other comprehensive losses that are expected to be recognized as components of net periodic benefit (credit) cost during 2016 are summarized below: Pension Plan Postretirement Total Amortization of prior service benefit $ 163 $ (146 ) $ 17 Amortization of net actuarial loss 3,017 506 3,523 Total $ 3,180 $ 360 $ 3,540 The weighted-average assumptions used to determine benefit obligations as of December 31, 2015 and 2014 and net periodic benefit (credit) cost for the years 2015 , 2014 and 2013 are provided below: Pension Plan and SERP Postretirement Plan Weighted-average assumptions used to determine benefit obligations: 2015 2014 2015 2014 Discount rate 4.73 % 3.99 % 3.25 % 3.00 % Expected return on plan assets 7.50 % 7.50 % 4.00 % 4.00 % Weighted-average assumptions used to determine net periodic benefit (credit) loss: 2015 2014 2013 2015 2014 2013 Discount rate 3.99 % 4.73 % 3.98 % 3.00 % 3.45 % 2.75 % Expected return on plan assets 7.50 % 7.50 % 7.50 % 4.00 % 5.00 % 5.00 % The following table presents the estimated future benefit payments for the respective plans. The future benefit payments for the Postretirement Plan are net of the federal Medicare subsidy. Pension Plan Postretirement Gross Benefit Gross Benefit Medicare Subsidy Net Benefit 2016 $ 30,037 $ 2,583 $ (365 ) $ 2,218 2017 $ 30,157 $ 2,401 $ (354 ) $ 2,047 2018 $ 29,751 $ 2,207 $ (344 ) $ 1,863 2019 $ 30,046 $ 2,003 $ (332 ) $ 1,671 2020 $ 29,791 $ 1,803 $ (319 ) $ 1,484 2021-2025 $ 145,032 $ 6,276 $ (963 ) $ 5,313 The healthcare cost trend rate for 2015 was 8.50% gradually decreasing to 5.00% in 2023. Assumed healthcare cost trend rates have a significant effect on the amounts reported for the healthcare plan. A 1.00% change in assumed healthcare cost trend rates would have the following effects: 1% 1% Effect of total service and interest cost components of net periodic postretirement healthcare benefit cost $ 13 $ (12 ) Effect on the healthcare component of the accumulated postretirement benefit obligation $ 394 $ (366 ) The expected subsidy from the Medicare Prescription Drug, Improvement and Modernization Act of 2003 reduced the Company’s accumulated postretirement benefit obligation by approximately $2,453 and $3,182 as of December 31, 2015 and 2014 , and the net periodic benefit cost by approximately $7 , $10 and $19 in fiscal 2015 , 2014 and 2013 , respectively. The expected return on the Pension Plan assets for 2015 and 2014 was 7.50% , which was determined by taking into consideration the Company’s analysis of its actual historical investment returns to a broader long-term forecast after adjusting for the target investment allocation and reflecting the current economic environment. The Company’s investment guidelines target investment allocation of 60% equity securities and 40% debt securities. The Pension Plan assets consist primarily of investments in various fixed income and equity funds. Investment guidelines are established with each investment manager. These guidelines provide the parameters within which the investment managers agree to operate, including criteria that determine eligible and ineligible securities, diversification requirements and credit quality standards, where applicable. Investment managers are prohibited from entering into any speculative hedging transactions. The investment objective is to achieve a maximum total return with strong emphasis on preservation of capital in real terms. The domestic equity portion of the total portfolio should range between 40% and 60% . The international equity portion of the total portfolio should range between 10% and 20% . The fixed income portion of the total portfolio should range between 20% and 40% . The asset allocation at December 31, 2015 and 2014 , and target allocation for 2016 by asset category are as follows: Asset Category Target Allocation Percentage of Plan Assets 2015 2014 Equity securities 60.00 % 60.00 % 56.80 % Debt securities 40.00 % 39.60 % 41.30 % Other — % 0.40 % 1.90 % Total 100.00 % 100.00 % 100.00 % The Company has used the target investment allocation to derive the expected return as the Company believes this allocation will be retained on an ongoing basis that will be commensurate with the projected cash flows of the plan. The expected return for each investment category within the target investment allocation is developed using average historical rates of return for each targeted investment category, considering the projected cash flow of the Pension Plan. The difference between this expected return and the actual return on plan assets is generally deferred and recognized over subsequent periods through future net periodic benefit costs. The Company believes that the use of the average historical rates of returns is consistent with the timing and amounts of expected contributions to the plans and benefit payments to plan participants. These considerations provide the basis for reasonable assumptions with respect to the expected long-term rate of return on plan assets. The Company also maintains a voluntary employees beneficiary association plan (the “VEBA Plan”) under Section 501(c)(9) of the Internal Revenue Code to fund the Postretirement Plan. The asset allocation for the VEBA Plan at December 31, 2015 and target allocation for 2016 are 100% in debt securities. For the year ended December 31, 2015 , the Company reclassified $142,117 of Pension Plan assets from Level 2 to Level 1. These assets, primarily consist of mutual funds used to be in the pooled separate accounts, were reinvested in a managed equity account. For assets that were transferred between Level 1 and Level 2 during the year, fair values are ascribed as if the assets had been transferred as of the beginning of the year. There were no transfers among Levels 1, 2 or 3 for the year ended December 31, 2014 . Refer to Note 7. Fair Value Measurements for further discussion with respect to fair value hierarchy. The following table summarizes the fair value measurements by level of the Pension Plan and Postretirement Plan assets: Total Quoted Prices Significant Other Significant December 31, 2015 Equity Managed equity accounts (1) $ 215,637 $ 215,637 $ — $ — Equity — pooled separate account (2) 47,314 — 47,314 — Equity — partnerships (3) 214 — — 214 Debt Fixed income manager — pooled separate account (2) 173,641 — 173,641 — Fixed income manager — government securities (4) 13,027 13,027 — — Other Cash — pooled separate account (2) 1,819 — 1,819 — Total $ 451,652 $ 228,664 $ 222,774 $ 214 December 31, 2014 Equity Managed equity accounts (1) $ 83,690 $ 83,690 $ — $ — Equity — pooled separate account (2) 186,102 — 186,102 — Equity — partnerships (3) 240 — — 240 Debt Fixed income manager — pooled separate account (2) 196,034 — 196,034 — Fixed income manager — government securities (4) 15,231 15,231 — — Other Cash — pooled separate account (2) 9,215 — 9,215 — Total $ 490,512 $ 98,921 $ 391,351 $ 240 (1) Valued at the closing price of shares for domestic stocks within the managed equity accounts, and valued at the net asset value (“NAV”) of shares for mutual funds at either the closing price reported in the active market or based on yields currently available on comparable securities of issuers with similar credit ratings for corporate bonds held by the Pension Plan in these managed accounts. (2) The pooled separate accounts invest in domestic and foreign stocks, bonds and mutual funds. The fair values of these stocks, bonds and mutual funds are publicly quoted and are used in determining the NAV of the pooled separate account, which is not publicly quoted. (3) Investments for which readily determinable prices do not exist are valued by the General Partner using either the market or income approach. In establishing the estimated fair value of investments, including those without readily determinable values, the General Partner assumes a reasonable period of time for liquidation of the investment, and takes into consideration the financial condition and operating results of the underlying portfolio company, nature of investment, restrictions on marketability, holding period, market conditions, foreign currency exposures, and other factors the General Partner deems appropriate. (4) The fund invested in the U.S. government, its agencies or instrumentalities or securities that are rated AAA by S&P, AAA by Fitch, or Aaa by Moody’s, including but not limited to mortgage securities such as agency and non-agency collateralized mortgage obligations, and other obligations that are secured by mortgages or mortgage backed securities, and valued at the closing price reported in the active market. The following table sets forth a summary of changes in fair value of the Pension Plan’s Level 3 assets for the years ended December 31: Equity-partnerships 2015 2014 Balance at January 1 $ 240 $ 635 Realized and unrealized loss on plan assets, net (26 ) (395 ) Balance at December 31 $ 214 $ 240

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting ASC 280-10, Disclosures About Segments of an Enterprise and Related Information (“ASC 280-10”), establishes standards for reporting information about operating segments. ASC 280-10 requires that a public business enterprise reports financial and descriptive information about its reportable operating segments. Operating segments are components of an enterprise for which separate financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. The Company’s President and CEO is identified as the CODM as defined by ASC 280-10. To align with the internal management of the Company’s business operations based on service offerings, the Company is organized into the following two operating segments, which are also the Company’s reportable segments: Decision Analytics: The Company develops solutions that its customers use to analyze key processes in managing risk. The Company’s combination of algorithms and analytic methods incorporates its proprietary data to generate solutions. In most cases, the Company’s customers integrate the solutions into their models, formulas or underwriting criteria in order to predict potential loss events, ranging from hurricanes and earthquakes to unanticipated healthcare claims. The Company develops catastrophe and extreme event models and offers solutions covering natural and man-made risks, including acts of terrorism. The Company also develops solutions that allow customers to quantify costs after loss events occur. Fraud solutions include data on claim histories, analysis of claims to find emerging patterns of fraud, and identification of suspicious claims in the insurance and healthcare sectors. The Company further leverages predictive models and proprietary data to advise customers to make asset investment and portfolio allocation decisions in the global energy market. On March 11, 2014, the Company sold the Company's mortgage services business, Interthinx. Results of operations for the mortgage services business are reported as a discontinued operation for the year ended December 31, 2014 and for all prior periods presented. Refer to Note 10 for more information. Risk Assessment: The Company is the leading provider of statistical, actuarial and underwriting data for the U.S. P&C insurance industry. The Company’s databases include cleansed and standardized records describing premiums and losses in insurance transactions, casualty and property risk attributes for commercial buildings and their occupants and fire suppression capabilities of municipalities. The Company uses this data to create policy language and proprietary risk classifications that are industry standards and to generate prospective loss cost estimates used to price insurance policies. The two aforementioned operating segments represent the segments for which separate discrete financial information is available and upon which operating results are regularly evaluated by the CODM in order to assess performance and allocate resources. The Company uses EBITDA as the profitability measure for making decisions regarding ongoing operations. EBITDA is net income before interest expense, provision for income taxes, depreciation and amortization of fixed and intangible assets. Operating expenses consist of direct and indirect costs principally related to personnel, facilities, software license fees, consulting, travel, and third-party information services. Indirect costs are generally allocated to the segments using fixed rates established by management based upon estimated expense contribution levels and other assumptions that management considers reasonable. The Company does not allocate interest expense and provision for income taxes, since these items are not considered in evaluating the segment’s overall operating performance. The CODM does not evaluate the financial performance of each segment based on assets or geographical locations. On a geographic basis, no individual country outside of the U.S. accounted for 10.0% or more of the Company's consolidated revenues for the years ended December 31, 2015 , 2014 and 2013 . The following table provides the Company’s revenue and EBITDA by reportable segment for the years ended December 31, as well as a reconciliation to operating income for all periods presented in the accompanying consolidated statements of operations: 2015 2014 2013 Decision Analytics Risk Assessment Total Decision Analytics Risk Assessment Total Decision Analytics Risk Assessment Total Revenues $ 1,379,819 $ 688,191 $ 2,068,010 $ 1,096,074 $ 650,652 $ 1,746,726 $ 977,427 $ 618,276 $ 1,595,703 Expenses: Cost of revenues (exclusive of items shown separately below) (603,309 ) (199,965 ) (803,274 ) (508,411 ) (208,187 ) (716,598 ) (427,978 ) (194,545 ) (622,523 ) Selling, general and administrative (230,844 ) (81,846 ) (312,690 ) (153,453 ) (73,853 ) (227,306 ) (151,557 ) (77,425 ) (228,982 ) Investment income and others, net 16,885 118 17,003 — 158 158 (16 ) 625 609 EBITDA from discontinued operations — — — 55,588 — 55,588 15,466 — 15,466 Gain on derivative instruments 85,187 — 85,187 — — — — — — EBITDA 647,738 406,498 1,054,236 489,798 368,770 858,568 413,342 346,931 760,273 Depreciation and amortization of fixed assets (94,834 ) (25,786 ) (120,620 ) (64,826 ) (20,680 ) (85,506 ) (51,739 ) (14,451 ) (66,190 ) Amortization of intangible assets (94,511 ) (353 ) (94,864 ) (56,517 ) (353 ) (56,870 ) (63,388 ) (353 ) (63,741 ) Investment income and others, net (16,885 ) (118 ) (17,003 ) — (158 ) (158 ) 16 (625 ) (609 ) EBITDA from discontinued operations — — — (55,588 ) — (55,588 ) (15,466 ) — (15,466 ) Gain on derivative instruments (85,187 ) — (85,187 ) — — — — — — Operating income $ 356,321 $ 380,241 736,562 $ 312,867 $ 347,579 660,446 $ 282,765 $ 331,502 614,267 Investment income and others, net 17,003 158 609 Gain on derivative instruments 85,187 — — Interest expense (121,316 ) (69,984 ) (76,136 ) Income from continuing operations before income taxes $ 717,436 $ 590,620 $ 538,740 Operating segment revenue by type of service is provided below for the years ended December 31: 2015 2014 2013 Decision Analytics Insurance $ 647,161 $ 598,757 $ 539,150 Financial services 116,556 96,763 81,113 Healthcare 307,291 315,628 271,538 Energy and specialized markets 308,811 84,926 85,626 Total Decision Analytics 1,379,819 1,096,074 977,427 Risk Assessment Industry-standard insurance programs 524,606 495,065 471,130 Property-specific rating and underwriting information 163,585 155,587 147,146 Total Risk Assessment 688,191 650,652 618,276 Total consolidated revenues $ 2,068,010 $ 1,746,726 $ 1,595,703 Long-lived assets by country are provided below: 2015 2014 Long-lived assets: U.S. $ 2,200,417 $ 1,893,660 U.K. 2,799,392 37,219 Other countries 11,549 29,968 Total long-lived assets $ 5,011,358 $ 1,960,847

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Parties	Related Parties: The Company considers its stockholders that own more than 5% of the outstanding stock within the class to be related parties as defined within ASC 850, Related Party Disclosures . The Company had no related parties owning more than 5% of the entire class of stock as of December 31, 2015 and 2014 . In addition, the Company had no revenues from related parties for the years ended December 31, 2015 , 2014 and 2013 .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: The Company’s operations are conducted on leased premises. Approximate minimum rentals under long-term noncancelable leases for all leased premises, computer equipment and automobiles are as follows: Years Ending Operating Leases Capital Leases 2016 $ 46,245 $ 4,976 2017 45,466 1,457 2018 37,398 641 2019 37,714 220 2020 40,276 53 2021 and thereafter 239,465 31 Net minimum lease payments $ 446,564 7,378 Less amount representing interest 250 Present value of net minimum lease capital payments $ 7,128 Most of the leases require payment of property taxes and utilities and, in certain cases, contain renewal options. Operating leases consist of office space. Capital leases consist of computer equipment, office equipment, and leased automobiles. Rent expense on operating leases approximated $45,423 , $35,149 and $32,186 in 2015 , 2014 and 2013 , respectively. In addition, the Company is a party to legal proceedings with respect to a variety of matters in the ordinary course of business, including the matters described below. With respect to ongoing matters, the Company is unable, at the present time, to determine the ultimate resolution of or provide a reasonable estimate of the range of possible loss attributable to these matters or the impact they may have on the Company’s results of operations, financial position or cash flows. This is primarily because the matters are generally in early stages and discovery has either not commenced or been completed. Although the Company believes it has strong defenses and intends to vigorously defend these matters, the Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations, financial position or cash flows. Intellicorp Records, Inc. Litigation On September 9, 2015, the Company was served with a nationwide putative class action complaint filed in the Court of Common Pleas, Cuyahoga County in Ohio naming the Company’s subsidiary Intellicorp Records, Inc. (“Intellicorp.”) titled Sherri Legrand v. Intellicorp Records, Inc. and The Cato Corporation et al. Defendants removed the case to the United States District Court for the Northern District of Ohio on October 8, 2015. Plaintiffs filed their First Amended Class Action Complaint on November 5, 2015 (“Amended Complaint”), which like the prior complaint claims violations of the Fair Credit Reporting Act and alleges two putative class claims against Intellicorp, namely (i) a section 1681k(a) claim on behalf of all individuals who were the subjects of consumer reports furnished by Intellicorp which contained public record information in the “Government Sanctions” section of the report on or after September 4, 2013 and continuing through the date the class list is prepared and (ii) a section 1681e(b) claim on behalf of all individuals who were the subjects of consumer reports furnished by Intellicorp which contained public record information in the “Government Sanctions” section of the report where the address or social security number of the subject of the report do not match the social security number or address contained in the government database on or after September 4, 2013 and continuing through the date the class list is prepared. Count I of the Amended Complaint alleges that defendant Cato violated the FCRA by procuring consumer reports on the plaintiff and other class members without making the stand-alone disclosure required by FCRA section 1681b(b)(2)(A)(i). Counts II and III allege that Intellicorp violated the FCRA section 1681e (b) by failing to follow reasonable procedures to assure maximum accuracy of the adverse information included in its consumer reports and FCRA section 1681k (a) by failing to maintain strict procedures to assure that the public record information reported which was likely to have an adverse effect on the consumer was complete and up to date, respectively. The Amended Complaint alleges that defendants acted willfully and seeks statutory damages for the classes in an amount not less than one hundred dollars and not more than one thousand dollars per violation, punitive damages, equitable relief, costs and attorney’s fees. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. On February 1, 2016, the Company was served with a nationwide putative class action complaint filed in the United States District Court for the Eastern District of North Carolina naming the Company’s subsidiary Intellicorp Records, Inc. (“Intellicorp.”) The complaint titled Frank DiSalvo v. Intellicorp Records, Inc. claims violations of the Fair Credit Reporting Act and alleges a section 1681b(b)(1) claim on behalf of all individuals residing in the United States who were the subjects of consumer reports furnished by Intellicorp for employment purposes within the period prescribed by the FCRA, 15 U.S.C. Section 1681p without first obtaining from the user of the report a certification that such user had complied with the obligations under Section 1681b(b)(2) as to the subject of the consumer report. The class complaint alleges that Intellicorp violated the FCRA section 1681b(b)(1) by failing to obtain the required specific certification from its customers to whom Intellicorp furnished consumer reports as to each consumer report provided before providing the specific consumer report that was the subject of the certification. The complaint alleges that the violations were willful or in the alternative negligent and seeks statutory damages for the class in an amount not less than one hundred dollars and not more than one thousand dollars per violation, punitive damages, equitable relief, costs and attorney’s fees. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. Xactware Solutions, Inc. Patent Litigation On October 8, 2015, the Company was served with a summons and complaint in an action titled Eagle View Technologies, Inc. and Pictometry International Group, Inc. v. Xactware Solutions, Inc. and Verisk Analytics, Inc. filed in the United States District Court for the District of New Jersey. The complaint alleges that the Company’s Roof InSight, Property InSight and Aerial Sketch products infringe seven patents owned by Eagle View and Pictometry namely, Patent Nos. 436, 840, 152, 880, 770, 732 and 454 (collectively the “Patents-in-Suit.”) On November 30, 2015, plaintiffs filed a First Amended Complaint (“Amended Complaint”) adding Patent Nos. 376 and 737 to the Patents in Suit. The Amended Complaint seeks an entry of judgment by the Court that defendants have and continue to directly infringe and/or indirectly infringe, by way of inducement the Patents in Suit, permanent injunctive relief, damages, costs and attorney’s fees. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. Interthinx, Inc. Litigation On April 20, 2015, the Company was served with a putative class action titled John Weber v. Interthinx, Inc. and Verisk Analytics, Inc. The plaintiff, a former employee of the Company’s former subsidiary Interthinx, Inc. in Missouri, filed the class action complaint in the United States District Court for the Eastern District of Missouri on behalf of all review appraisers and individuals holding comparable positions with different titles who were employed by Interthinx for the last three years nationwide and who were not paid overtime wages. The class complaint claims that the review appraiser employees were misclassified as exempt employees and, as a result, were denied certain wages and benefits that would have been received if they were properly classified as non-exempt employees. It pleads a Collective Action under section 216(b) of the Fair Labor Standards Act for unpaid overtime and seeks overtime wages, liquidated damages, declaratory relief, interest, costs and attorneys’ fees. On March 11, 2014, the Company sold 100 percent of the stock of Interthinx, Inc. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. MediConnect Global, Inc. Litigation On October 11, 2013, the Company was served with a summons and complaint in an action titled Naveen Trehan v. MediConnect Global, Inc., Amy Anderson and Verisk Health, Inc. filed on October 9, 2013 in the United States District Court for the District of Utah. The complaint, brought by a former minority shareholder of the Company’s subsidiary, MediConnect Global, Inc., arises from MediConnect’s buyout of Naveen Trehan and his family members’ shares on October 15, 2010. Plaintiff claims that the sale of the shares was based on MediConnect’s representations concerning third parties that had expressed interest in an acquisition, merger or investment in MediConnect at that time. Plaintiff claims that MediConnect did not disclose the Company, which purchased MediConnect on March 23, 2012, as a possible suitor. The complaint alleges four causes of action: (1) breach of fiduciary duty against MediConnect and Amy Anderson for failure to disclose the Company's interest in acquiring, merging with or investing in MediConnect prior to the buyout of his shares; (2) fraud against Amy Anderson and MediConnect for intentionally providing false information to plaintiff with the purpose of inducing him to agree to sell his shares at an artificially low price; (3) negligent misrepresentation against Amy Anderson and MediConnect for their negligent failure to discover and disclose the Company's interest in acquiring MediConnect prior to the buyout of plaintiff’s shares and (4) a violation of SEC Rule 10b-5 against Amy Anderson and MediConnect for defrauding plaintiff and failing to disclose material information in connection with the sale of securities. The complaint seeks joint and several recoveries from Amy Anderson and MediConnect for compensatory damages, punitive damages, and disgorgement of all profits earned through the investment of plaintiff’s funds, attorneys’ fees, interest and an order from the court that plaintiff’s funds be held in a constructive trust. On November 2, 2015, the court issued a judgement in favor of the defendants and dismissed all claims with prejudice. Plaintiff filed a Notice of Appeal on November 30, 2015. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. Insurance Services Office, Inc. Litigation On August 1, 2014, the Company was served with an Amended Complaint filed in the United States District Court for the District of Colorado titled Snyder, et. al. v. ACORD Corp., et al. The action is brought by nineteen individual plaintiffs, on their own behalf and on behalf of a putative class, against more than 120 defendants, including the Company and its subsidiary, Insurance Services Office, Inc. ("ISO"). Except for the Company, ISO and the defendant Acord Corporation, which provides standard forms to assist in insurance transactions, most of the other defendants are property and casualty insurance companies that plaintiffs claim conspired to underpay property damage claims. Plaintiffs claim that the Company and ISO, along with all of the other defendants, violated state and federal antitrust and racketeering laws as well as state common law. On September 8, 2014, the Court entered an Order striking the Amended Complaint and granting leave to the plaintiffs to file a new complaint. On October 13, 2014, plaintiffs filed their Second Amended Complaint, which was re-filed by plaintiffs to correct errors as the Third Amended Complaint. The Third Amended Complaint similarly alleges that the defendants conspired to underpay property damage claims, but does not specifically allege what role the Company or ISO played in the alleged conspiracy. It claims that the Company and ISO, along with all of the other defendants, violated state and federal antitrust and racketeering laws as well as state common law, and seeks all available relief including, injunctive, statutory, actual and punitive damages as well as attorneys’ fees. On January 15, 2016, the court granted defendants’ motions to dismiss all claims asserted in the Third Amended Complaint and plaintiffs filed a Motion for Reconsideration on February 16, 2016. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter. On February 19, 2016, the Company was served with a notice of a summons and complaint filed on January 29, 2016 against the Company’s subsidiary Insurance Services Office, Inc. (“ISO”) in the U.S. District Court for the District of Connecticut titled Halloran et al. v. Harleysville Preferred Insurance Co. et al. The putative class action is brought on behalf of four policyholders and similarly situated policyholders in eastern Connecticut who complain that their homeowner’s insurance carriers denied their claims for the deterioration and collapse of their foundations caused by defective concrete. The lawsuit alleges a breach of contract claim against insurers Harleysville, Nationwide and Kemper and an anticipatory breach of contract claim against insurer MetLife. It also alleges that ISO as the drafter of the standardized policy language at issue participated with over 100 insurance companies to deny claims for defective concrete and collapsed foundations and violated the Connecticut Unfair Trade Practices (CUTPA) and the Connecticut Unfair Insurance Practices Act (CUIPA). The plaintiffs ask that the Court certify a class of persons similarly situated and seek recovery from over 100 insurance carriers equal to the cost for the replacement of their concrete foundations, injunctive relief, attorneys’ fees, costs and interest. At this time, it is not possible to determine the ultimate resolution of, or estimate the liability related to this matter.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events: The Company continues to explore strategic alternatives for the Healthcare business within the Decision Analytics operating segment as it initially announced in October 2015. There is no assurance that the exploration of strategic alternatives will result in any transaction.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts and Reserves	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts and Reserves	Schedule II Valuation and Qualifying Accounts and Reserves For the Years Ended December 31, 2015 , 2014 and 2013 (In thousands) Description Balance at Beginning of Year Charged to Expenses (1) Deductions— Write-offs(2) Adjustment (3) Balance at End of Year Year ended December 31, 2015 Allowance for doubtful accounts $ 5,995 $ 1,305 $ (2,230 ) $ — $ 5,070 Valuation allowance for income taxes $ 789 $ 175 $ (92 ) $ — $ 872 Year ended December 31, 2014 Allowance for doubtful accounts $ 4,415 $ 1,814 $ (161 ) $ (73 ) $ 5,995 Valuation allowance for income taxes $ 741 $ 48 $ — $ — $ 789 Year Ended December 31, 2013 Allowance for doubtful accounts $ 4,753 $ 2,468 $ (2,284 ) $ (522 ) $ 4,415 Valuation allowance for income taxes $ 595 $ 673 $ (527 ) $ — $ 741 (1) Primarily additional reserves for bad debts (2) Primarily accounts receivable balances written off, net of recoveries, and the expiration of loss carryforwards (3) Related to discontinued operations

Basis of Presentation and Sum33

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Intercompany Accounts and Transactions	The consolidated financial statements include the accounts of Verisk. All intercompany accounts and transactions have been eliminated.
Revenue Recognition	The following describes the Company’s primary types of revenues and the applicable revenue recognition policies. The Company’s revenues are primarily derived from sales of services and revenue is recognized as services are performed and information is delivered to customers. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, fees and/or price is fixed or determinable, and collectability is reasonably assured. Revenue is recognized net of applicable sales tax withholdings. Industry-Standard Insurance Programs Industry-standard insurance programs, statistical agent and data services and actuarial services are sold to participating insurance company customers under annual agreements covering a calendar year where the price is determined at the inception of the agreement. In accordance with Accounting Standards Codification (“ASC”) 605, Revenue Recognition, the Company recognizes revenue ratably over the term of these annual agreements, as services are performed and continuous access to information is provided over the entire term of the agreements. Property-Specific Rating and Underwriting Information The Company provides property-specific rating information through reports issued for specific commercial properties, for which revenue is recognized when the report is delivered to the customer, provided that all other revenue recognition criteria are met. In addition, the Company provides hosting or software solutions that provide continuous access to information about the properties being insured and underwriting information in the form of standard policy forms to be used by customers. As the customer has a contractual right to take possession of the software without significant penalty, revenues from these arrangements are recognized ratably over the contract period from the time when the customer had access to the solution in accordance with ASC 985-605, Software Revenue Recognition (“ASC 985-605”). The Company recognizes software license revenue when the arrangement does not require significant production, customization or modification of the software and the following criteria are met: persuasive evidence of an agreement exists, delivery has occurred, fees are fixed or determinable, and collections are probable. These software arrangements include post-contract customer support (“PCS”). The Company recognizes software license revenue ratably over the duration of the annual license term as vendor specific objective evidence (“VSOE”) of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. Insurance Insurance services primarily consist of term-based software licenses. These software arrangements include PCS, which includes unspecified upgrades on a when-and-if available basis. The Company recognizes software license revenue ratably over the duration of the annual license term as VSOE of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. In certain instances, the customers are billed for access on a monthly basis for the term-based software licenses and the Company recognizes revenue accordingly. There are also services within insurance, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Financial Services Financial services include various types of services to customers. The Company primarily recognizes revenue ratably for these services over the term of the agreements, as services are performed and continuous service is provided over the entire term of the agreements. In addition, there are certain services which are comprised of transaction-based fees; in these instances, revenue is recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Healthcare The Company provides software hosting arrangements to customers whereby the customer does not have the right to take possession of the software. As these arrangements include PCS throughout the hosting term, revenues from these multiple element arrangements are recognized in accordance with ASC 605-25, Revenue Recognition — Multiple Element Arrangements (“ASC 605-25”). The Company recognizes revenue ratably over the duration of the license term, which ranges from one to five years, since the contractual elements do not have stand alone value. There are also services within healthcare, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. Energy and Specialized Markets The Company provides hosting solutions that give continuous access to research information such as data analytics and commercial intelligence for the energy, chemicals, metals and mining verticals. For the hosting arrangements, whereby the customer does not have the right to take possession of the software, which include PCS throughout the hosting term, revenues from these multiple element arrangements are recognized in accordance with ASC 605-25. The Company recognizes revenue ratably over the duration of the license term, since the contractual elements do not have stand alone value. Specialized markets consist of term-based software licenses. These software arrangements include PCS, which includes unspecified upgrades on a when-and-if available basis. The Company recognizes software license revenue ratably over the duration of the annual license term as VSOE of PCS, the only remaining undelivered element, cannot be established in accordance with ASC 985-605. The PCS associated with these arrangements is coterminous with the duration of the license term. In certain instances, the customers are billed for access on a monthly basis for the term-based software licenses and the Company recognizes revenue accordingly. In addition, specialized markets are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met. The Company services long-term contract arrangements with certain customers. For these arrangements, revenue is recognized in accordance with ASC 605-35, Revenue Recognition — Construction-Type and Production-Type Contracts (“ASC 605-35”), using the percentage-of-completion method, which requires the use of estimates. In such instances, management is required to estimate the input measures, based on hours incurred to date compared to total estimated hours of the project, with consideration also given to output measures, such as contract milestones, when applicable. Adjustments to estimates are made in the period in which the facts requiring such revisions become known. Accordingly, recognized revenues and profits are subject to revisions as the contract progresses to completion. The Company considers the contract substantially complete when there is compliance with all performance specifications and there are no remaining costs or potential risk. There are also services within energy and specialized markets, which are comprised of transaction-based fees recognized as information is delivered to customers, provided that all other revenue recognition criteria have been met.
Deferred Revenues	The Company invoices its customers in annual, quarterly, monthly or milestone installments. Amounts billed and collected in advance of earnings are recorded as “Deferred revenues” in the accompanying consolidated balance sheets and are recognized as the services are performed and the applicable revenue recognition criteria are met.
Fixed Assets	Property and equipment, internal-use software and finite-lived intangibles are stated at cost less accumulated depreciation and amortization, which are computed on a straight-line basis over their estimated useful lives. Leasehold improvements are amortized over the shorter of the useful life of the asset or the lease term.
Finite-lived Intangible Assets	Property and equipment, internal-use software and finite-lived intangibles are stated at cost less accumulated depreciation and amortization, which are computed on a straight-line basis over their estimated useful lives. Leasehold improvements are amortized over the shorter of the useful life of the asset or the lease term.
Internal Use Software	The Company’s internal software development costs primarily relate to internal-use software. Such costs are capitalized in the application development stage in accordance with ASC 350-40, Internal-use Software . The Company also capitalizes software development costs upon the establishment of technological feasibility for a product in accordance with ASC 985-20, Software to be Sold, Leased, or Marketed (“ASC 985-20”). Software development costs are amortized on a straight-line basis over a three -year period, which management believes represents the useful life of these capitalized costs.
Fixed Assets and Finite-Lived Intangible Assets Impairment	In accordance with ASC 360, Property, Plant & Equipment , whenever events or changes in circumstances indicate that the carrying amount of long-lived assets and finite-lived intangible assets may not be recoverable, the Company reviews its long-lived assets and finite-lived intangible assets for impairment by first comparing the carrying value of the assets to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the assets. If the carrying value exceeds the sum of the assets’ undiscounted cash flows, the Company estimates and recognizes an impairment loss by taking the difference between the carrying value and fair value of the assets
Capital and Operating Leases	The Company leases various property, plant and equipment. Leased property is accounted for under ASC 840, Leases (“ASC 840”). Accordingly, leased property that meets certain criteria is capitalized and the present value of the related lease payments is recorded as a liability. Amortization of assets accounted for as capital leases is computed utilizing the straight-line method over the shorter of the remaining lease term or the estimated useful life (principally three to four years for computer equipment and automobiles). All other leases are accounted for as operating leases. Rent expense for operating leases, which may have rent escalation provisions or rent holidays, is recorded on a straight-line basis over the non-cancelable lease period in accordance with ASC 840. The initial lease term generally includes the build-out period, where no rent payments are typically due under the terms of the lease. The difference between rent expensed and rent paid is recorded as deferred rent. Construction allowances received from landlords are recorded as a deferred rent credit and amortized to rent expense over the term of the lease.
Investments	The Company’s investments at December 31, 2015 and 2014 included registered investment companies and equity investments in non-public companies. The Company accounts for short-term investments in accordance with ASC 320, Investments-Debt and Equity Securities (“ASC 320”). There were no investments classified as trading securities at December 31, 2015 or 2014 . All investments with readily determinable market values are classified as available-for-sale. While these investments are not held with the specific intention to sell them, they may be sold to support the Company’s investment strategies. All available-for-sale investments are carried at fair value. The cost of all available-for-sale investments sold is based on the specific identification method, with the exception of mutual fund-based investments, which is based on the weighted average cost method. Dividend income is accrued on the ex-dividend date. The Company performs reviews of its investment portfolio when individual holdings have experienced a decline in fair value below their respective cost. The Company considers a number of factors in the evaluation of whether a decline in value is other-than-temporary including: (a) the financial condition and near term prospects of the issuer; (b) the Company’s ability and intent to retain the investment for a period of time sufficient to allow for an anticipated recovery in value; and (c) the period and degree to which the market value has been below cost. Where the decline is deemed to be other-than-temporary, a charge is recorded to “Investment income and others” in the accompanying consolidated statements of operations, and a new cost basis is established for the investment. The Company’s equity investments in non-public companies are included in “Other assets” in the accompanying consolidated balance sheets. Those securities are carried at cost, as the Company owns less than 20% of the stock and does not otherwise have the ability to exercise significant influence. These securities are written down to their estimated realizable value when management considers there is an other-than-temporary decline in value based on financial information received and the business prospects of the entity.
Fair Value Measurements	The Company follows the provisions of ASC 820-10, Fair Value Measurements (“ASC 820-10”), which defines fair value, establishes a framework for measuring fair value under U.S. GAAP and expands fair value measurement disclosures. The Company follows the provisions of ASC 820-10 for its financial assets and liabilities recognized or disclosed at fair value on a recurring basis. The Company follows the provisions of ASC 820-10 for its non-financial assets and liabilities recognized or disclosed at fair value. Certain assets and liabilities of the Company are reported at fair value in the accompanying consolidated balance sheets. Such assets and liabilities include amounts for both financial and non-financial instruments. To increase consistency and comparability of assets and liabilities recorded at fair value, ASC 820-10 establishes a three-level fair value hierarchy to prioritize the inputs to valuation techniques used to measure fair value. ASC 820-10 requires disclosures detailing the extent to which companies’ measure assets and liabilities at fair value, the methods and assumptions used to measure fair value and the effect of fair value measurements on earnings. In accordance with ASC 820-10, the Company applied the following fair value hierarchy: Level 1 — Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments. Level 2 — Assets and liabilities valued based on observable market data for similar instruments. Level 3 — Assets or liabilities for which significant valuation assumptions are not readily observable in the market; instruments valued based on the best available data, some of which is internally-developed, and considers risk premiums that a market participant would require.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts receivable is generally recorded at the invoiced amount. The allowance for doubtful accounts is estimated based on an analysis of the aging of the accounts receivable, historical write-offs, customer payment patterns, individual customer creditworthiness, current economic trends, and/or establishment of specific reserves for customers in adverse financial condition. The Company assesses the adequacy of the allowance for doubtful accounts on a quarterly basis.
Foreign Currency	The Company has determined local currencies are the functional currencies of the foreign operations. The assets and liabilities of foreign subsidiaries are translated at the period-end rate of exchange and statement of operations items are translated at the average rates prevailing during the year. The resulting translation adjustment is recorded as a component of “Accumulated other comprehensive losses” in the accompanying consolidated statements of changes in stockholders’ equity.
Stock Based Compensation	The Company follows ASC 718, Stock Compensation (“ASC 718”). Under ASC 718, stock based compensation cost is measured at the grant date, based on the fair value of the awards granted, and is recognized as expense over the requisite service period. Other equity awards, including restricted stock, are valued at the closing price of the Company’s common stock on the grant date. Restricted stock generally has a service vesting period of four years and the Company recognizes the expense ratably over this service vesting period. The Company estimates expected forfeitures of equity awards at the date of grant and recognizes compensation expense only for those awards expected to vest. The forfeiture assumption is ultimately adjusted to the actual forfeiture rate. Changes in the forfeiture assumptions may impact the total amount of expense ultimately recognized, as well as the timing of expense recognized over the requisite service period.
Research and Development Costs	Research and development costs, which are primarily related to the personnel and related overhead costs incurred in developing new services for customers, are expensed as incurred.
Advertising Costs	Advertising costs, which are primarily associated with promoting the Company’s brand, names and solutions provided, are expensed as incurred.
Income Taxes	The Company accounts for income taxes under the asset and liability method under ASC 740, Income Taxes (“ASC 740”), which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Deferred tax assets are recorded to the extent these assets are more likely than not to be realized. In making such determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. Valuation allowances are recognized to reduce deferred tax assets if it is determined to be more likely than not that all or some of the potential deferred tax assets will not be realized. The Company follows ASC 740-10, Income Taxes (“ASC 740-10”) , which clarifies the accounting for uncertainty in income taxes recognized in the financial statements. ASC 740-10 provides that a tax benefit from an uncertain tax position may be recognized based on the technical merits when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes. Income tax positions must meet a more likely than not recognition threshold in accordance with ASC 740-10. This standard also provides guidance on measurement, derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. The Company recognizes interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying consolidated statements of operations. Accrued interest and penalties are included within “Other liabilities” on the accompanying consolidated balance sheets.
Earnings Per Share	Basic and diluted earnings per share (“EPS”) are determined in accordance with ASC 260, Earnings per Share , which specifies the computation, presentation and disclosure requirements for EPS. Basic EPS excludes all dilutive common stock equivalents. It is based upon the weighted average number of common shares outstanding during the period. Diluted EPS, as calculated using the treasury stock method, reflects the potential dilution that would occur if the Company’s dilutive outstanding stock options and stock awards were issued.
Pension and Postretirement Benefits	The Company accounts for its pension and postretirement benefits under ASC 715, Compensation — Retirement Benefits (“ASC 715”). ASC 715 requires the recognition of the funded status of a benefit plan in the balance sheet, the recognition in other comprehensive income (loss) of gains or losses and prior service costs or credits arising during the period, but which are not included as components of periodic benefit cost, and the measurement of defined benefit plan assets and obligations as of the balance sheet date. The Company utilizes a valuation date of December 31.
Product Warranty Obligations	The Company provides warranty coverage for certain of its solutions. The Company recognizes a product warranty obligation when claims are probable and can be reasonably estimated. As of December 31, 2015 and 2014 , product warranty obligations were not material. In the ordinary course of business, the Company enters into numerous agreements that contain standard indemnities whereby the Company indemnifies another party for breaches of confidentiality, infringement of intellectual property or gross negligence. Such indemnifications are primarily granted under licensing of computer software. Most agreements contain provisions to limit the maximum potential amount of future payments that the Company could be required to make under these indemnifications; however, the Company is not able to develop an estimate of the maximum potential amount of future payments to be made under these indemnifications as the triggering events are not subject to predictability.
Loss Contingencies	The Company accrues for costs relating to litigation, claims and other contingent matters when such liabilities become probable and reasonably estimable. Such estimates are based on management’s judgment. Actual amounts paid may differ from amounts estimated, and such differences will be charged to operations in the period in which the final determination of the liability is made.
Goodwill	Goodwill represents the excess of acquisition costs over the fair value of tangible net assets and identifiable intangible assets of the businesses acquired. Goodwill and intangible assets deemed to have indefinite lives are not amortized. Intangible assets determined to have finite lives are amortized over their useful lives. Goodwill and intangible assets with indefinite lives are subject to impairment testing annually as of June 30 or whenever events or changes in circumstances indicate that the carrying amount may not be fully recoverable. The Company completed the required annual impairment test as of June 30, 2015 , which resulted in no impairment of goodwill in 2015 . This test compares the carrying value of each reporting unit to its fair value. If the fair value of the reporting unit exceeds the carrying value of the net assets, including goodwill assigned to that reporting unit, goodwill is not impaired. If the carrying value of the reporting unit’s net assets, including goodwill, exceeds the fair value of the reporting unit, then the Company will determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss is recorded for the difference between the carrying amount and the implied fair value of the goodwill.
Recent Accounting Pronouncements	In April 2015, the Financial Accounting Standard Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU No. 2015-03"). The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU No. 2015-03 is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company has elected not to early adopt. The adoption of ASU No. 2015-03 is not expected to have a material impact on the Company's consolidated financial statements. In April 2015, the FASB issued ASU 2015-05, Customer's Accounting for Fees Paid in a Cloud Computing Arrangement ("ASU No. 2015-05"). This guidance is intended to help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement, primarily to determine whether the arrangement includes a sale or license of software. ASU No. 2015-05 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. The Company has elected to adopt ASU No. 2015-05 in 2016. The adoption of ASU No. 2015-05 is not expected to have a material impact on the Company's consolidated financial statements. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date ("ASU No. 2015-14"). The amendments in this update defer the effective date of ASU No. 2014-09, Revenue from Contracts with Customers ("ASU No. 2015-09"), for all entities by one year. Public business entities will apply the guidance in ASU No. 2015-09 for annual reporting periods beginning after December 15, 2017. The Company is currently evaluating ASU No. 2015-09 and has not determined the impact this standard may have on its financial statements nor decided upon the method of adoption. In August 2015, the FASB issued ASU No. 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements ("ASU No. 2015-15"). ASU No. 2015-15 clarifies that ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs , does not address the presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. As a result, an entity may present debt issuance costs related to line-of-credit arrangements as an asset instead of as a direct deduction from the carrying amount of the debt. The Company has elected not to early adopt ASU No. 2015-15. The adoption of ASU No. 2015-15 is not expected to have a material impact on the Company's consolidated financial statements. In September 2015, the FASB issued ASU No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments ("ASU No. 2015-16"). ASU No. 2015-16 requires, for business combinations, that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU No. 2015-16 is effective for fiscal years beginning after December 15, 2015. Early adoption is permitted for reporting periods for which financial statements have not been issued. The Company has elected to early adopt ASU No. 2015-16 on a prospective basis. Adoption of this guidance did not have a material impact on the results of operations or financial position (see Note 9). In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes ("ASU No. 2015-17"). This ASU requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position. The Company early adopted ASU No. 2015-17 effective December 31, 2015 on a prospective basis. Adoption of this ASU resulted in a reclassification of the net current deferred tax asset to the net non-current deferred tax asset in the accompanying consolidated balance sheet as of December 31, 2015. No prior periods were retrospectively adjusted. The Company applied this guidance to its current fiscal year ending December 31, 2015. Adoption of this guidance did not have a material impact on the results of operations or financial position (see Note 12).
Equity Method Investments	In addition to the available-for-sale securities above, the Company has equity investments in non-public companies in which the Company acquired non-controlling interests and for which no readily determinable market value exists. These securities were accounted for under the cost method in accordance with ASC 323-10-25, The Equity Method of Accounting for Investments in Common Stock .
Segment Reporting	ASC 280-10, Disclosures About Segments of an Enterprise and Related Information (“ASC 280-10”), establishes standards for reporting information about operating segments. ASC 280-10 requires that a public business enterprise reports financial and descriptive information about its reportable operating segments. Operating segments are components of an enterprise for which separate financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. The Company’s President and CEO is identified as the CODM as defined by ASC 280-10. To align with the internal management of the Company’s business operations based on service offerings, the Company is organized into the following two operating segments, which are also the Company’s reportable segments: Decision Analytics: The Company develops solutions that its customers use to analyze key processes in managing risk. The Company’s combination of algorithms and analytic methods incorporates its proprietary data to generate solutions. In most cases, the Company’s customers integrate the solutions into their models, formulas or underwriting criteria in order to predict potential loss events, ranging from hurricanes and earthquakes to unanticipated healthcare claims. The Company develops catastrophe and extreme event models and offers solutions covering natural and man-made risks, including acts of terrorism. The Company also develops solutions that allow customers to quantify costs after loss events occur. Fraud solutions include data on claim histories, analysis of claims to find emerging patterns of fraud, and identification of suspicious claims in the insurance and healthcare sectors. The Company further leverages predictive models and proprietary data to advise customers to make asset investment and portfolio allocation decisions in the global energy market. On March 11, 2014, the Company sold the Company's mortgage services business, Interthinx. Results of operations for the mortgage services business are reported as a discontinued operation for the year ended December 31, 2014 and for all prior periods presented. Refer to Note 10 for more information. Risk Assessment: The Company is the leading provider of statistical, actuarial and underwriting data for the U.S. P&C insurance industry. The Company’s databases include cleansed and standardized records describing premiums and losses in insurance transactions, casualty and property risk attributes for commercial buildings and their occupants and fire suppression capabilities of municipalities. The Company uses this data to create policy language and proprietary risk classifications that are industry standards and to generate prospective loss cost estimates used to price insurance policies.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Accounts Receivable	Accounts receivable consisted of the following at December 31: 2015 2014 Billed receivables $ 283,509 $ 203,339 Unbilled receivables 41,660 23,324 Total receivables 325,169 226,663 Less allowance for doubtful accounts (5,070 ) (5,995 ) Accounts receivable, net $ 320,099 $ 220,668

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of Available-for-Sale Securities	Available-for-sale securities consisted of the following: Adjusted Cost Gross Unrealized Loss Fair Value December 31, 2015 Registered investment companies $ 3,622 $ (46 ) $ 3,576 December 31, 2014 Registered investment companies $ 4,045 $ (244 ) $ 3,801
Realized Gain/(Loss) on Securities, Net	Realized gain (loss) on securities, net, was as follows for the years ended December 31: 2015 2014 2013 Gross realized gain on sale of securities $ 15,718 $ 285 $ 966 Other-than-temporary impairment of securities (316 ) (28 ) (84 ) Other-than-temporary impairment of non-controlling interest in non-public companies — — (974 ) Realized gain (loss) on securities, net $ 15,402 $ 257 $ (92 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Accounted at Fair Value	The following table summarizes fair value measurements by level for cash equivalents and registered investment companies that were measured at fair value on a recurring basis: Total Quoted Prices Significant December 31, 2015 Registered investment companies(1) $ 3,576 $ 3,576 $ — December 31, 2014 Cash equivalents – money-market funds $ 3,707 $ — $ 3,707 Registered investment companies(1) $ 3,801 $ 3,801 $ — (1) Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned.
Schedule of Carrying Values and Estimated Fair Values of Long-Term Debt	The following table summarizes the carrying value and estimated fair value of the long-term debt as of December 31, 2015 and 2014 respectively: 2015 2014 Carrying Estimated Carrying Estimated Financial instrument not carried at fair value: Long-term debt excluding capitalized leases $ 2,290,862 $ 2,328,134 $ 1,265,848 $ 1,371,213

Fixed Assets (Tables)

Fixed Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Fixed Assets	The following is a summary of fixed assets: Useful Life Cost Accumulated Net December 31, 2015 Furniture and office equipment 3-10 years $ 250,673 $ (167,148 ) $ 83,525 Leasehold improvements Lease term 71,061 (30,104 ) 40,957 Purchased software 3 years 130,760 (99,820 ) 30,940 Software development costs 3 years 410,872 (152,204 ) 258,668 Leased equipment 3-4 years 33,098 (29,020 ) 4,078 Total fixed assets $ 896,464 $ (478,296 ) $ 418,168 December 31, 2014 Furniture and office equipment 3-10 years $ 199,199 $ (131,055 ) $ 68,144 Leasehold improvements Lease term 65,212 (27,884 ) 37,328 Purchased software 3 years 116,089 (80,794 ) 35,295 Software development costs 3 years 266,559 (111,766 ) 154,793 Leased equipment 3-4 years 32,776 (26,063 ) 6,713 Total fixed assets $ 679,835 $ (377,562 ) $ 302,273

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Schedule of Preliminary Purchase Price Allocations of the Acquisitions	The preliminary purchase price allocations of the acquisitions resulted in the following: Wood Mackenzie Others Total Cash and cash equivalents $ 35,398 $ 5,405 $ 40,803 Accounts receivable 80,825 1,954 82,779 Current assets 97,505 419 97,924 Fixed assets 71,929 267 72,196 Intangible assets 1,111,950 22,172 1,134,122 Goodwill 1,994,018 36,328 2,030,346 Other assets 2,007 5,022 7,029 Total assets acquired 3,393,632 71,567 3,465,199 Current liabilities 110,000 3,437 113,437 Deferred revenues 142,457 2,801 145,258 Deferred income taxes, net 209,032 4,016 213,048 Other liabilities 7,116 4,717 11,833 Total liabilities assumed 468,605 14,971 483,576 Net assets acquired 2,925,027 56,596 2,981,623 Less: Cash acquired 35,398 5,405 40,803 Net cash purchase price $ 2,889,629 $ 51,191 $ 2,940,820 The preliminary purchase price allocation of the acquisition resulted in the following: Maplecroft Accounts receivable $ 1,833 Current assets 543 Fixed assets 98 Intangible assets 13,270 Goodwill 21,369 Total assets acquired 37,113 Current liabilities 4,318 Deferred income taxes, net 2,654 Total liabilities assumed 6,972 Net assets acquired $ 30,141
Schedule of Unaudited Pro Forma Information	The unaudited pro forma information includes intangible asset amortization charges and incremental borrowing costs as a result of the acquisition, net of related tax, estimated using the Company’s effective tax rate for continuing operations for the periods presented. 2015 2014 (unaudited) Pro forma revenues $ 2,207,724 $ 2,121,241 Pro forma income from continuing operations $ 507,416 $ 425,397 Pro forma basic income from continuing operations per share $ 3.07 $ 2.57 Pro forma diluted income from continuing operations per share $ 3.01 $ 2.52
Amounts Assigned to Intangible Assets	The preliminary amounts by type for the Wood Mackenzie acquisition are summarized in the table below: Weighted Total Technology-based 7 years $ 104,663 Marketing-related 20 years 232,935 Customer-related 15 years 278,106 Database-related 20 years 496,246 Total intangible assets $ 1,111,950 The preliminary amounts assigned to intangible assets by type for the acquisition are summarized in the table below: Weighted Total Technology-based 10 years $ 3,202 Marketing-related 10 years 458 Customer-related 10 years 9,610 Total intangible assets 10 years $ 13,270

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following table summarizes the results from the discontinued operation for the years ended December 31: 2014 2013 Revenues from discontinued operations $ 11,512 $ 109,151 Income from discontinued operations before income taxes (including gain on sale of $65,410 in 2014) 54,482 10,819 Provision for income taxes (including tax on the gain on sale in 2014) (25,305 ) (4,753 ) Income from discontinued operations, net of tax $ 29,177 $ 6,066

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Goodwill	The following is a summary of the change in goodwill from December 31, 2013 through December 31, 2015 , both in total and as allocated to the Company’s operating segments: Risk Decision Total Goodwill at December 31, 2013 (1) $ 55,555 $ 1,126,126 $ 1,181,681 Current year acquisitions — 22,740 22,740 Acquisition related escrow funding — 2,725 2,725 Goodwill at December 31, 2014 (1) 55,555 1,151,591 1,207,146 Current year acquisitions — 2,030,346 2,030,346 Purchase accounting reclassifications — 1,589 1,589 Foreign currency translation adjustment — (104,255 ) (104,255 ) Goodwill at December 31, 2015 (1) $ 55,555 $ 3,079,271 $ 3,134,826 (1) These balances are net of accumulated impairment charges of $3,244 that occurred prior to December 31, 2013 .
Intangible Assets and Related Accumulated Amortization	The Company’s intangible assets and related accumulated amortization consisted of the following: Weighted Cost Accumulated Net December 31, 2015 Technology-based 8 years $ 417,884 $ (219,975 ) $ 197,909 Marketing-related 16 years 292,012 (66,214 ) 225,798 Contract-based 6 years 6,555 (6,555 ) — Customer-related 13 years 653,223 (155,804 ) 497,419 Database-based 20 years 470,367 (14,748 ) 455,619 Total intangible assets $ 1,840,041 $ (463,296 ) $ 1,376,745 December 31, 2014 Technology-based 8 years $ 299,705 $ (195,698 ) $ 104,007 Marketing-related 5 years 71,504 (54,745 ) 16,759 Contract-based 6 years 6,555 (6,555 ) — Customer-related 13 years 399,011 (113,301 ) 285,710 Total intangible assets $ 776,775 $ (370,299 ) $ 406,476
Estimated Amortization Expense	Estimated amortization expense in future periods through 2021 and thereafter for intangible assets subject to amortization is as follows: Year Amount 2016 $ 120,523 2017 119,616 2018 118,870 2019 117,410 2020 115,955 2021 and thereafter 784,371 Total $ 1,376,745

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	Domestic and foreign income from continuing operations before income taxes was as follows: 2015 2014 2013 U.S. $ 605,777 $ 584,658 $ 532,933 Foreign 111,659 5,962 5,807 Total income from continuing operations $ 717,436 $ 590,620 $ 538,740
Provision for Income Taxes	The components of the provision for income taxes from continuing operations for the years ended December 31 were as follows: 2015 2014 2013 Current: Federal $ 181,536 $ 167,683 $ 134,014 State and local 25,565 26,333 18,764 Foreign 3,414 1,470 1,201 Total current provision for income taxes 210,515 195,486 153,979 Deferred: Federal 21,969 27,220 37,894 State and local 1,671 (2,740 ) 4,287 Foreign (24,296 ) (211 ) 266 Total deferred provision for income taxes (656 ) 24,269 42,447 Provision for income taxes $ 209,859 $ 219,755 $ 196,426
Effective Tax Rate on Income from Continuing Operations	The reconciliation between the Company’s effective tax rate on income from continuing operations and the statutory tax rate is as follows for the years ended December 31: 2015 2014 2013 Federal statutory rate 35.0 % 35.0 % 35.0 % State and local taxes, net of federal tax benefit 2.6 % 2.7 % 2.6 % Foreign tax differentials (6.5 )% (0.1 )% (0.1 )% UK legislative change (2.0 )% — % — % Other 0.2 % (0.4 )% (1.0 )% Effective tax rate for continuing operations 29.3 % 37.2 % 36.5 %
Summary of Deferred Tax Assets	The tax effects of significant items comprising the Company’s deferred tax assets as of December 31 are as follows: 2015 2014 Deferred income tax asset: Employee wages, pension and other benefits $ 26,086 $ 29,756 Deferred revenue — 1,835 Deferred rent 6,935 5,463 Net operating loss carryover 2,593 4,292 State tax adjustments 4,334 2,472 Capital and other unrealized losses 3,358 3,255 Other 11,193 4,956 Total 54,499 52,029 Less valuation allowance (873 ) (789 ) Deferred income tax asset 53,626 51,240 Deferred income tax liability: Fixed assets and intangible assets (443,990 ) (242,857 ) Other (6,066 ) (6,151 ) Deferred income tax liability (450,056 ) (249,008 ) Deferred income tax liability, net $ (396,430 ) $ (197,768 )
Summary of Company's Net Operating Loss Carryforwards Expires	The Company’s net operating loss carryforwards expire as follows: Years Amount 2016-2023 $ 3,428 2024-2028 12,418 2029-2035 40,720 Total $ 56,566
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefit	A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows: 2015 2014 2013 Unrecognized tax benefit at January 1 $ 10,637 $ 9,524 $ 17,883 Gross increase in tax positions in prior period 7,137 2,679 541 Gross decrease in tax positions in prior period (2,666 ) — (4,241 ) Gross increase in tax positions from stock acquisitions — — — Settlements (285 ) — (390 ) Lapse of statute of limitations (348 ) (1,566 ) (4,269 ) Unrecognized tax benefit at December 31 $ 14,475 $ 10,637 $ 9,524

Composition of Certain Financ42

Composition of Certain Financial Statement Captions (Tables)	12 Months Ended
	Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Schedule of Other Current Assets, Accounts Payable, Accrued Liabilities and Other Liabilities	The following table presents the components of “Other current assets”, “Accounts payable and accrued liabilities” and “Other liabilities” as of December 31: 2015 2014 Other current assets: Acquisition related escrows $ 38,690 $ 5,583 Other current assets 14,262 13,292 Total other current assets $ 52,952 $ 18,875 Accounts payable and accrued liabilities: Accrued salaries, benefits and other related costs $ 101,259 $ 87,729 Escrow liabilities 38,632 5,565 Trade accounts payable and other accrued expenses 105,773 87,432 Total accounts payable and accrued liabilities $ 245,664 $ 180,726 Other liabilities: Unrecognized tax benefits, including interest and penalty $ 17,290 $ 13,455 Deferred rent 33,093 22,386 Other liabilities 9,715 7,547 Total other liabilities $ 60,098 $ 43,388

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Short-Term and Long-Term Debt	The following table presents short-term and long-term debt by issuance as of December 31: Issuance Date Maturity Date 2015 2014 Short-term debt and current portion of long-term debt: Syndicated revolving credit facility Various Various $ 870,000 $ 160,000 Prudential shelf notes: 5.84% Series H shelf notes 10/26/2007 10/26/2015 — 17,500 6.28% Series I shelf notes 4/29/2008 4/29/2015 — 85,000 New York Life shelf notes: 5.87% Series A shelf notes 10/26/2007 10/26/2015 — 17,500 6.35% Series B shelf notes 4/29/2008 4/29/2015 — 50,000 Capital lease obligations Various Various 4,811 6,058 Short-term debt and current portion of long-term debt 874,811 336,058 Long-term debt: Senior notes: 4.000% senior notes, less unamortized discount of $4,532 and $0, respectively 5/15/2015 6/15/2025 895,468 — 5.500% senior notes, less unamortized discount of $1,175 and $0, respectively 5/15/2015 6/15/2045 348,825 — 4.125% senior notes, less unamortized discount of $1,860 and $2,137, respectively 9/12/2012 9/12/2022 348,140 347,863 4.875% senior notes, less unamortized discount of $1,023 and $1,361, respectively 12/8/2011 1/15/2019 248,977 248,639 5.80% senior notes, less unamortized discount of $548 and $654, respectively 4/6/2011 5/1/2021 449,452 449,346 Prudential shelf notes: 6.85% Series J shelf notes 6/15/2009 6/15/2016 — 50,000 Capital lease obligations Various Various 2,317 5,026 Long-term debt 2,293,179 1,100,874 Total debt $ 3,167,990 $ 1,436,932
Summary of Long Term Debt Maturities	The following table reflects the Company’s debt maturities: Year Amount 2016 $ 874,811 2017 1,411 2018 618 2019 250,210 2020 48 2021 and thereafter 2,050,030 Total $ 3,177,128

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following is a reconciliation of the numerators and denominators of the basic and diluted EPS computations for the years ended December 31: 2015 2014 2013 (In thousands, except for share and per share data) Numerator used in basic and diluted EPS: Income from continuing operations $ 507,577 $ 370,865 $ 342,314 Income from discontinued operations — 29,177 6,066 Net income $ 507,577 $ 400,042 $ 348,380 Denominator: Weighted average number of common shares used in basic EPS 165,090,380 165,823,803 168,031,412 Effect of dilutive shares: Potential common stock issuable from stock options and stock awards 3,360,963 3,308,620 4,244,948 Weighted average number of common shares and dilutive potential common shares used in diluted EPS 168,451,343 169,132,423 172,276,360
Summary of Accumulated Other Comprehensive Losses	The following is a summary of accumulated other comprehensive losses as of December 31: 2015 2014 Foreign currency translation adjustment $ (165,828 ) $ (3,086 ) Unrealized gains (losses) on available-for-sale securities, net of tax 3 (110 ) Pension and postretirement adjustment, net of tax (76,227 ) (77,318 ) Accumulated other comprehensive losses $ (242,052 ) $ (80,514 ) The pre-tax components included within accumulated other comprehensive losses as of December 31 are summarized below: Pension Plan and SERP Postretirement Plan 2015 2014 2015 2014 Prior service benefit $ 3,830 $ — $ (854 ) $ (1,000 ) Actuarial losses 116,400 120,735 6,725 8,321 Accumulated other comprehensive losses, pretax $ 120,230 $ 120,735 $ 5,871 $ 7,321
Schedule of Amounts Recognized in Other Comprehensive Income	The before tax and after tax amounts of other comprehensive income for the years ended December 31, 2015 , 2014 and 2013 are summarized below: Before Tax Tax Benefit After Tax December 31, 2015 Foreign currency translation adjustment $ (162,742 ) $ — $ (162,742 ) Unrealized holding gain on available-for-sale securities before reclassifications 398 (162 ) 236 Amount reclassified from accumulated other comprehensive losses (1) (200 ) 77 (123 ) Unrealized holding gain on available-for-sale securities 198 (85 ) 113 Pension and postretirement adjustment before reclassifications 5,197 (2,105 ) 3,092 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (3,242 ) 1,241 (2,001 ) Pension and postretirement adjustment 1,955 (864 ) 1,091 Total other comprehensive loss $ (160,589 ) $ (949 ) $ (161,538 ) December 31, 2014 Foreign currency translation adjustment $ (1,286 ) $ — $ (1,286 ) Unrealized holding loss on available-for-sale securities before reclassifications (314 ) 121 (193 ) Amount reclassified from accumulated other comprehensive losses (1) 257 (99 ) 158 Unrealized holding loss on available-for-sale securities (57 ) 22 (35 ) Pension and postretirement adjustment before reclassifications (56,635 ) 21,629 (35,006 ) Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (1,134 ) 435 (699 ) Pension and postretirement adjustment (57,769 ) 22,064 (35,705 ) Total other comprehensive loss $ (59,112 ) $ 22,086 $ (37,026 ) December 31, 2013 Foreign currency translation adjustment $ (840 ) $ — $ (840 ) Unrealized holding loss on available-for-sale securities before reclassifications (1,122 ) 433 (689 ) Amount reclassified from accumulated other comprehensive losses (1) 882 (340 ) 542 Unrealized holding loss on available-for-sale securities (240 ) 93 (147 ) Pension and postretirement adjustment before reclassifications 80,773 (30,611 ) 50,162 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (2) (5,699 ) 2,196 (3,503 ) Pension and postretirement adjustment 75,074 (28,415 ) 46,659 Total other comprehensive income $ 73,994 $ (28,322 ) $ 45,672 (1) This accumulated other comprehensive losses component, before tax, is included under “Investment income and others” in the accompanying consolidated statements of operations. (2) This accumulated other comprehensive losses component, before tax, is included under “Cost of revenues” and “Selling, general and administrative” in the accompanying consolidated statements of operations. This component is also included in the computation of net periodic benefit (credit) cost (see Note 17 Pension and Postretirement Benefits for additional details).

Compensation Plans (Tables)

Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Other Share-based Compensation, Activity	A summary of the equity awards granted for the year ended December 31, 2015 is presented below. Grant Date Service Vesting Period Stock Options Restricted Stock Common Stock April 1, 2015 Four-year graded vesting 1,177,191 211,756 — April 1, 2015 Not applicable — — 840 May 19, 2015 Immediate vesting on grant date 255,473 52,960 — May 19, 2015 Four-year graded vesting 225,363 42,064 — May 19, 2015 Four-year cliff vesting 127,931 28,445 — July 1, 2015 Immediate vesting on grant date 27,047 1,131 — July 1, 2015 One-year cliff vesting 51,876 9,988 — July 1, 2015 Not applicable — — 3,873 July 1, 2015 Four-year graded vesting 2,244 418 — July 8, 2015 Four-year graded vesting 3,778 692 — July 13, 2015 Four-year graded vesting 1,304 244 — August 3, 2015 Four-year graded vesting 927 173 — August 10, 2015 Four-year graded vesting 1,776 335 — August 24, 2015 Four-year graded vesting 3,737 691 — November 9, 2015 Four-year graded vesting 5,615 1,107 — 1,884,262 350,004 4,713
Fair Value of Stock Options Granted Using Black- Scholes Valuation Model	The fair value of the stock options granted was estimated on the date of grant using a Black-Scholes option valuation model that uses the weighted-average assumptions noted in the following table during the years ended December 31: 2015 2014 2013 Expected volatility 19.51 % 20.53 % 29.27 % Risk-free interest rate 1.29 % 1.48 % 0.70 % Expected term in years 4.5 4.4 4.5 Dividend yield — % — % — % Weighted average grant date fair value per stock option $ 13.58 $ 11.86 $ 15.58
Options Outstanding Under Incentive Plan and Option Plan	A summary of options outstanding under the Incentive Plan and the Option Plan and changes during the three years then ended is presented below: Number Weighted Aggregate (In thousands, except for share and per share data) Outstanding at January 1, 2013 12,573,298 $ 22.21 $ 361,653 Granted 888,038 $ 61.10 Exercised (4,076,750 ) $ 19.79 $ 168,056 Cancelled or expired (149,266 ) $ 43.14 Outstanding at December 31, 2013 9,235,320 $ 26.67 $ 360,611 Granted 1,242,428 $ 59.83 Exercised (1,091,746 ) $ 22.29 $ 43,863 Cancelled or expired (180,312 ) $ 55.23 Outstanding at December 31, 2014 9,205,690 $ 31.11 $ 303,267 Granted 1,884,262 $ 72.20 Exercised (1,739,847 ) $ 23.71 $ 87,008 Cancelled or expired (232,372 ) $ 64.05 Outstanding at December 31, 2015 9,117,733 $ 40.17 $ 334,691 Options exercisable at December 31, 2015 6,541,229 $ 29.81 $ 307,924 Options exercisable at December 31, 2014 7,159,895 $ 24.00 $ 286,728
Summary of Nonvested Options	A summary of the status of the Company’s nonvested options and changes is presented below: Number Weighted Nonvested balance at January 1, 2013 3,776,302 $ 9.43 Granted 888,038 $ 15.58 Vested (2,448,843 ) $ 8.81 Cancelled or expired (149,266 ) $ 12.18 Nonvested balance at December 31, 2013 2,066,231 $ 12.61 Granted 1,242,428 $ 11.86 Vested (1,082,552 ) $ 11.71 Cancelled or expired (180,312 ) $ 13.56 Nonvested balance at December 31, 2014 2,045,795 $ 12.55 Granted 1,884,262 $ 13.58 Vested (1,121,181 ) $ 13.24 Cancelled or expired (232,372 ) $ 13.05 Nonvested balance at December 31, 2015 2,576,504 $ 12.95
Summary of Restricted Stock Activity Under Incentive Plan	A summary of the status of the restricted stock awarded under the 2013 Incentive Plan and changes is presented below: Number Weighted Outstanding at January 1, 2013 331,013 $ 42.78 Granted 241,674 $ 61.12 Vested (150,668 ) $ 37.82 Forfeited (25,270 ) $ 53.00 Outstanding at December 31, 2013 396,749 $ 52.82 Granted 246,003 $ 59.86 Vested (163,280 ) $ 49.94 Forfeited (37,162 ) $ 55.53 Outstanding at December 31, 2014 442,310 $ 56.84 Granted 350,004 $ 72.24 Vested (211,265 ) $ 58.64 Forfeited (47,281 ) $ 63.10 Outstanding at December 31, 2015 533,768 $ 66.25

Pension and Postretirement Be46

Pension and Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Summary of Changes in Benefit Obligations and Plan Assets Amount Recognized	The following table sets forth the changes in the benefit obligations and the plan assets, the (funded) unfunded status of the Pension Plan, SERP and Postretirement Plan, and the amounts recognized in the Company’s consolidated balance sheets at December 31: Pension Plan and SERP Postretirement Plan 2015 2014 2015 2014 Change in benefit obligation: Benefit obligation at January 1 $ 471,259 $ 420,664 $ 18,773 $ 20,399 Interest cost 18,102 19,073 520 593 Actuarial loss (gain) (44,159 ) 61,804 (1,584 ) (411 ) Plan amendments 3,830 — — — Plan participants’ contributions — — 1,903 2,635 Benefits paid (29,406 ) (30,282 ) (4,464 ) (4,834 ) Federal subsidy on benefits paid — — 739 391 Benefit obligation at December 31 $ 419,626 $ 471,259 $ 15,887 $ 18,773 Accumulated benefit obligation at December 31 $ 419,626 $ 471,259 Change in plan assets: Fair value of plan assets at January 1 $ 475,281 $ 467,912 $ 15,231 $ 16,601 Actual return on plan assets, net of expenses (8,220 ) 36,474 14 743 Employer contributions, net 970 1,177 (396 ) (305 ) Plan participants’ contributions — — 1,903 2,635 Benefits paid (29,406 ) (30,282 ) (4,464 ) (4,834 ) Subsidies received — — 739 391 Fair value of plan assets at December 31 $ 438,625 $ 475,281 $ 13,027 $ 15,231 (Funded) unfunded status at December 31 $ (18,999 ) $ (4,022 ) $ 2,860 $ 3,542 Amounts recognized in the consolidated balance sheets consist of: Pension assets, noncurrent $ (32,922 ) $ (18,589 ) $ — $ — Pension, SERP and postretirement benefits, current 952 762 879 1,132 Pension, SERP and postretirement benefits, noncurrent 12,971 13,805 1,981 2,410 Total Pension, SERP and Postretirement benefits $ (18,999 ) $ (4,022 ) $ 2,860 $ 3,542
Summary of Pre-Tax Components of Accumulated Other Comprehensive Losses	The following is a summary of accumulated other comprehensive losses as of December 31: 2015 2014 Foreign currency translation adjustment $ (165,828 ) $ (3,086 ) Unrealized gains (losses) on available-for-sale securities, net of tax 3 (110 ) Pension and postretirement adjustment, net of tax (76,227 ) (77,318 ) Accumulated other comprehensive losses $ (242,052 ) $ (80,514 ) The pre-tax components included within accumulated other comprehensive losses as of December 31 are summarized below: Pension Plan and SERP Postretirement Plan 2015 2014 2015 2014 Prior service benefit $ 3,830 $ — $ (854 ) $ (1,000 ) Actuarial losses 116,400 120,735 6,725 8,321 Accumulated other comprehensive losses, pretax $ 120,230 $ 120,735 $ 5,871 $ 7,321
Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income	The pre-tax components of net periodic benefit (credit) cost and the amounts recognized in other comprehensive loss (income) are summarized below for the years ended December 31: Pension Plan and SERP Postretirement Plan 2015 2014 2013 2015 2014 2013 Interest cost $ 18,102 $ 19,073 $ 17,860 $ 520 $ 593 $ 608 Expected return on plan assets (34,432 ) (33,942 ) (30,480 ) (563 ) (786 ) (919 ) Amortization of prior service benefit — — — (146 ) (146 ) (146 ) Amortization of net actuarial loss 2,828 763 5,078 560 517 767 Net periodic benefit (credit) cost (13,502 ) (14,106 ) (7,542 ) 371 178 310 Amortization of actuarial loss reclassified from accumulated other comprehensive losses (174 ) (354 ) (1,320 ) — — — Amortization of prior service benefit reclassified from accumulated other comprehensive losses — — — 146 146 146 Net loss recognized reclassified from accumulated other comprehensive losses (2,653 ) (409 ) (3,758 ) — — — Plan amendments 3,830 — — — — — Actuarial gain (loss) (1,508 ) 59,272 (70,065 ) (1,596 ) (886 ) (77 ) Total recognized in other comprehensive loss (income) (505 ) 58,509 (75,143 ) (1,450 ) (740 ) 69 Total recognized in net periodic benefit (credit) cost and other comprehensive loss (income) $ (14,007 ) $ 44,403 $ (82,685 ) $ (1,079 ) $ (562 ) $ 379
Summary of Accumulated Other Comprehensive Losses Recognized in Net Periodic Benefit	The estimated amounts in accumulated other comprehensive losses that are expected to be recognized as components of net periodic benefit (credit) cost during 2016 are summarized below: Pension Plan Postretirement Total Amortization of prior service benefit $ 163 $ (146 ) $ 17 Amortization of net actuarial loss 3,017 506 3,523 Total $ 3,180 $ 360 $ 3,540
Summary of Weighted-Average Assumptions Used in Calculating Net Periodic Benefit (Credit) Cost	The weighted-average assumptions used to determine benefit obligations as of December 31, 2015 and 2014 and net periodic benefit (credit) cost for the years 2015 , 2014 and 2013 are provided below: Pension Plan and SERP Postretirement Plan Weighted-average assumptions used to determine benefit obligations: 2015 2014 2015 2014 Discount rate 4.73 % 3.99 % 3.25 % 3.00 % Expected return on plan assets 7.50 % 7.50 % 4.00 % 4.00 % Weighted-average assumptions used to determine net periodic benefit (credit) loss: 2015 2014 2013 2015 2014 2013 Discount rate 3.99 % 4.73 % 3.98 % 3.00 % 3.45 % 2.75 % Expected return on plan assets 7.50 % 7.50 % 7.50 % 4.00 % 5.00 % 5.00 %
Summary of Estimated Future Benefit Payments for Respective Plans	The following table presents the estimated future benefit payments for the respective plans. The future benefit payments for the Postretirement Plan are net of the federal Medicare subsidy. Pension Plan Postretirement Gross Benefit Gross Benefit Medicare Subsidy Net Benefit 2016 $ 30,037 $ 2,583 $ (365 ) $ 2,218 2017 $ 30,157 $ 2,401 $ (354 ) $ 2,047 2018 $ 29,751 $ 2,207 $ (344 ) $ 1,863 2019 $ 30,046 $ 2,003 $ (332 ) $ 1,671 2020 $ 29,791 $ 1,803 $ (319 ) $ 1,484 2021-2025 $ 145,032 $ 6,276 $ (963 ) $ 5,313
Summary of Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates	A 1.00% change in assumed healthcare cost trend rates would have the following effects: 1% 1% Effect of total service and interest cost components of net periodic postretirement healthcare benefit cost $ 13 $ (12 ) Effect on the healthcare component of the accumulated postretirement benefit obligation $ 394 $ (366 )
Summary of Asset Allocation and Target Allocation	The following table summarizes the fair value measurements by level of the Pension Plan and Postretirement Plan assets: Total Quoted Prices Significant Other Significant December 31, 2015 Equity Managed equity accounts (1) $ 215,637 $ 215,637 $ — $ — Equity — pooled separate account (2) 47,314 — 47,314 — Equity — partnerships (3) 214 — — 214 Debt Fixed income manager — pooled separate account (2) 173,641 — 173,641 — Fixed income manager — government securities (4) 13,027 13,027 — — Other Cash — pooled separate account (2) 1,819 — 1,819 — Total $ 451,652 $ 228,664 $ 222,774 $ 214 December 31, 2014 Equity Managed equity accounts (1) $ 83,690 $ 83,690 $ — $ — Equity — pooled separate account (2) 186,102 — 186,102 — Equity — partnerships (3) 240 — — 240 Debt Fixed income manager — pooled separate account (2) 196,034 — 196,034 — Fixed income manager — government securities (4) 15,231 15,231 — — Other Cash — pooled separate account (2) 9,215 — 9,215 — Total $ 490,512 $ 98,921 $ 391,351 $ 240 (1) Valued at the closing price of shares for domestic stocks within the managed equity accounts, and valued at the net asset value (“NAV”) of shares for mutual funds at either the closing price reported in the active market or based on yields currently available on comparable securities of issuers with similar credit ratings for corporate bonds held by the Pension Plan in these managed accounts. (2) The pooled separate accounts invest in domestic and foreign stocks, bonds and mutual funds. The fair values of these stocks, bonds and mutual funds are publicly quoted and are used in determining the NAV of the pooled separate account, which is not publicly quoted. (3) Investments for which readily determinable prices do not exist are valued by the General Partner using either the market or income approach. In establishing the estimated fair value of investments, including those without readily determinable values, the General Partner assumes a reasonable period of time for liquidation of the investment, and takes into consideration the financial condition and operating results of the underlying portfolio company, nature of investment, restrictions on marketability, holding period, market conditions, foreign currency exposures, and other factors the General Partner deems appropriate. (4) The fund invested in the U.S. government, its agencies or instrumentalities or securities that are rated AAA by S&P, AAA by Fitch, or Aaa by Moody’s, including but not limited to mortgage securities such as agency and non-agency collateralized mortgage obligations, and other obligations that are secured by mortgages or mortgage backed securities, and valued at the closing price reported in the active market. The asset allocation at December 31, 2015 and 2014 , and target allocation for 2016 by asset category are as follows: Asset Category Target Allocation Percentage of Plan Assets 2015 2014 Equity securities 60.00 % 60.00 % 56.80 % Debt securities 40.00 % 39.60 % 41.30 % Other — % 0.40 % 1.90 % Total 100.00 % 100.00 % 100.00 %
Summary of Changes in Fair Value of Pension Plans	The following table sets forth a summary of changes in fair value of the Pension Plan’s Level 3 assets for the years ended December 31: Equity-partnerships 2015 2014 Balance at January 1 $ 240 $ 635 Realized and unrealized loss on plan assets, net (26 ) (395 ) Balance at December 31 $ 214 $ 240

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Reconciliation Income Before Income Taxes	The following table provides the Company’s revenue and EBITDA by reportable segment for the years ended December 31, as well as a reconciliation to operating income for all periods presented in the accompanying consolidated statements of operations: 2015 2014 2013 Decision Analytics Risk Assessment Total Decision Analytics Risk Assessment Total Decision Analytics Risk Assessment Total Revenues $ 1,379,819 $ 688,191 $ 2,068,010 $ 1,096,074 $ 650,652 $ 1,746,726 $ 977,427 $ 618,276 $ 1,595,703 Expenses: Cost of revenues (exclusive of items shown separately below) (603,309 ) (199,965 ) (803,274 ) (508,411 ) (208,187 ) (716,598 ) (427,978 ) (194,545 ) (622,523 ) Selling, general and administrative (230,844 ) (81,846 ) (312,690 ) (153,453 ) (73,853 ) (227,306 ) (151,557 ) (77,425 ) (228,982 ) Investment income and others, net 16,885 118 17,003 — 158 158 (16 ) 625 609 EBITDA from discontinued operations — — — 55,588 — 55,588 15,466 — 15,466 Gain on derivative instruments 85,187 — 85,187 — — — — — — EBITDA 647,738 406,498 1,054,236 489,798 368,770 858,568 413,342 346,931 760,273 Depreciation and amortization of fixed assets (94,834 ) (25,786 ) (120,620 ) (64,826 ) (20,680 ) (85,506 ) (51,739 ) (14,451 ) (66,190 ) Amortization of intangible assets (94,511 ) (353 ) (94,864 ) (56,517 ) (353 ) (56,870 ) (63,388 ) (353 ) (63,741 ) Investment income and others, net (16,885 ) (118 ) (17,003 ) — (158 ) (158 ) 16 (625 ) (609 ) EBITDA from discontinued operations — — — (55,588 ) — (55,588 ) (15,466 ) — (15,466 ) Gain on derivative instruments (85,187 ) — (85,187 ) — — — — — — Operating income $ 356,321 $ 380,241 736,562 $ 312,867 $ 347,579 660,446 $ 282,765 $ 331,502 614,267 Investment income and others, net 17,003 158 609 Gain on derivative instruments 85,187 — — Interest expense (121,316 ) (69,984 ) (76,136 ) Income from continuing operations before income taxes $ 717,436 $ 590,620 $ 538,740
Operating Segment Revenue by Type of Service	Operating segment revenue by type of service is provided below for the years ended December 31: 2015 2014 2013 Decision Analytics Insurance $ 647,161 $ 598,757 $ 539,150 Financial services 116,556 96,763 81,113 Healthcare 307,291 315,628 271,538 Energy and specialized markets 308,811 84,926 85,626 Total Decision Analytics 1,379,819 1,096,074 977,427 Risk Assessment Industry-standard insurance programs 524,606 495,065 471,130 Property-specific rating and underwriting information 163,585 155,587 147,146 Total Risk Assessment 688,191 650,652 618,276 Total consolidated revenues $ 2,068,010 $ 1,746,726 $ 1,595,703
Long-lived Assets by Geographic Areas	Long-lived assets by country are provided below: 2015 2014 Long-lived assets: U.S. $ 2,200,417 $ 1,893,660 U.K. 2,799,392 37,219 Other countries 11,549 29,968 Total long-lived assets $ 5,011,358 $ 1,960,847

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Minimum Rentals under Long Term Noncancelable Leases for All Leased Premises, Computer Equipment and Automobiles	Approximate minimum rentals under long-term noncancelable leases for all leased premises, computer equipment and automobiles are as follows: Years Ending Operating Leases Capital Leases 2016 $ 46,245 $ 4,976 2017 45,466 1,457 2018 37,398 641 2019 37,714 220 2020 40,276 53 2021 and thereafter 239,465 31 Net minimum lease payments $ 446,564 7,378 Less amount representing interest 250 Present value of net minimum lease capital payments $ 7,128

Basis of Presentation and Sum49

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Term of license, minimum	1 year
Term of license, maximum	5 years
Investment classified as trading securities	$ 0	$ 0
Percent of corporate wholly-owned subsidiaries (less than)	20.00%
Restricted stock service vesting period (in years)	4 years
Research and development costs	$ 22,737,000	25,508,000	$ 21,426,000
Advertisement costs	7,125,000	$ 6,360,000	$ 8,457,000
Impairment of goodwill	$ 0
Restricted Stock [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Restricted stock service vesting period (in years)	4 years
Software development costs [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)	3 years
Capital lease agreements [Member] | Minimum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)	3 years
Capital lease agreements [Member] | Maximum [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)	4 years

Concentration of Credit Risk -

Concentration of Credit Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)BankCustomer	Dec. 31, 2014USD ($)BankCustomer	Dec. 31, 2013Customer
Concentration Risk [Line Items]
Total cash balances insured by the Federal Deposit Insurance Corporation | $	$ 250,000	$ 250,000
Cash balances on deposit | $	$ 85,000,000	$ 16,316,000
Number of banks | Bank	6	6
Cash deposit with foreign banks | $	$ 52,092,000	$ 21,886,000
Number of customers		0	0
Sales Revenue, Net [Member] | Top Fifty Customers [Member]
Concentration Risk [Line Items]
Number of customers	50	50	50
Concentration risk percent	36.00%	41.00%	38.00%
Sales Revenue, Net [Member] | Individual Customer [Member]
Concentration Risk [Line Items]
Number of customers	0	0	0
Concentration risk percent	2.00%	5.00%	3.00%
Accounts Receivable [Member] | Individual Customer [Member]
Concentration Risk [Line Items]
Number of customers	0	0
Concentration risk percent	3.00%	7.00%

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details)	12 Months Ended
	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Maturity of time deposits	90 days

Accounts Receivable - Summary o

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 325,169	$ 226,663
Less allowance for doubtful accounts	(5,070)	(5,995)
Accounts receivable, net	320,099	220,668
Billed receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	283,509	203,339
Unbilled receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 41,660	$ 23,324

Investments - Summary of Availa

Investments - Summary of Available-for-Sale Securities (Detail) - Registered investment companies [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 3,622	$ 4,045
Gross Unrealized Loss	(46)	(244)
Fair Value	$ 3,576	$ 3,801

Investments - Realized Gain_(Lo

Investments - Realized Gain/(Loss) on Securities, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Gross realized gain on sale of securities	$ 15,718	$ 285	$ 966
Other-than-temporary impairment of securities	(316)	(28)	(84)
Other-than-temporary impairment of non-controlling interest in non-public companies	0	0	(974)
Realized gain (loss) on securities, net	$ 15,402	$ 257	$ (92)

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investments in private equity securities accounted for under cost method investment	$ 8,487	$ 8,487

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities Accounted at Fair Value (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Cash equivalents - money - market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents – money-market funds			$ 3,707
Registered investment companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Registered investment companies	[1]	$ 3,576	3,801
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash equivalents - money - market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents – money-market funds			0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Registered investment companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Registered investment companies	[1]	3,576	3,801
Significant Other Observable Inputs (Level 2) [Member] | Cash equivalents - money - market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents – money-market funds			3,707
Significant Other Observable Inputs (Level 2) [Member] | Registered investment companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Registered investment companies	[1]	$ 0	$ 0
[1]	Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned.

Fair Value Measurements - Long-

Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt excluding capitalized leases	$ 2,290,862	$ 1,265,848
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt excluding capitalized leases	$ 2,328,134	$ 1,371,213

Fixed Assets - Summary of Fixed

Fixed Assets - Summary of Fixed Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Cost	$ 896,464	$ 679,835
Accumulated Depreciation and Amortization	(478,296)	(377,562)
Net	418,168	302,273
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	250,673	199,199
Accumulated Depreciation and Amortization	(167,148)	(131,055)
Net	$ 83,525	$ 68,144
Furniture and office equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years	3 years
Furniture and office equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	10 years	10 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 71,061	$ 65,212
Accumulated Depreciation and Amortization	(30,104)	(27,884)
Net	40,957	37,328
Purchased software [Member]
Property, Plant and Equipment [Line Items]
Cost	130,760	116,089
Accumulated Depreciation and Amortization	(99,820)	(80,794)
Net	$ 30,940	$ 35,295
Useful Life	3 years	3 years
Software development costs [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 410,872	$ 266,559
Accumulated Depreciation and Amortization	(152,204)	(111,766)
Net	$ 258,668	$ 154,793
Useful Life	3 years	3 years
Leased equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 33,098	$ 32,776
Accumulated Depreciation and Amortization	(29,020)	(26,063)
Net	$ 4,078	$ 6,713
Leased equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years	3 years
Leased equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life	4 years	4 years

Fixed Assets - Additional Infor

Fixed Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation and amortization of fixed assets	$ 120,620	$ 85,506	$ 66,190
Amortization expense related to software development	34,842	19,000	12,806
Software development costs [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization of fixed assets	9,228	4,497	3,623
Unamortized software development costs	$ 94,733	$ 34,749	$ 29,149

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Nov. 20, 2015	Nov. 06, 2015	May. 19, 2015	Dec. 08, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Equity method investment, ownership percentage					20.00%
Net cash purchase price					$ 2,940,820
Goodwill acquisition related escrow funding			$ 78,694
Gain on derivative instruments			$ 85,187		85,187	$ 0	$ 0
Initial accounting incomplete, adjustment, intangibles					(182,994)
Deferred tax liability adjustment					(49,944)
Other adjustments					(3,871)
Goodwill adjustment					136,921
Transaction costs						349
Amount funded for escrows					83,411	0	$ 0
Current portion of escrow					38,690	5,583
Noncurrent portion of escrow					4,591	$ 0
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business transaction costs					27,637
Interest Expense [Member]
Business Acquisition [Line Items]
Business transaction costs					13,336
PCI [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage	100.00%
Net cash purchase price	$ 37,387
Infield [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage		100.00%
Net cash purchase price		$ 13,804
Wood Mackenzie [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage			100.00%
Net cash purchase price			$ 2,889,629
Escrow Release					37,005
Maplecroft [Member]
Business Acquisition [Line Items]
Net cash purchase price				$ 30,141
Percentage of acquisition				100.00%
Amount funded for escrows				$ 2,725
MediConnect [Member]
Business Acquisition [Line Items]
Escrow Release					$ 5,144

Acquisitions - Purchase Price A

Acquisitions - Purchase Price Allocations of Acquisitions (Detail) - USD ($) $ in Thousands	May. 19, 2015	Dec. 08, 2014	Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]
Cash and cash equivalents			$ 40,803
Accounts receivable			82,779
Current assets			97,924
Fixed assets			72,196
Intangible assets			1,134,122
Goodwill			2,030,346
Other assets			7,029
Total assets acquired			3,465,199
Current liabilities			113,437
Deferred revenues			145,258
Deferred income taxes, net			213,048
Other liabilities			11,833
Total liabilities assumed			483,576
Net assets acquired			2,981,623
Net cash purchase price			2,940,820
Wood Mackenzie [Member]
Business Acquisition, Contingent Consideration [Line Items]
Cash and cash equivalents	$ 35,398
Accounts receivable	80,825
Current assets	97,505
Fixed assets	71,929
Intangible assets	1,111,950
Goodwill	1,994,018
Other assets	2,007
Total assets acquired	3,393,632
Current liabilities	110,000
Deferred revenues	142,457
Deferred income taxes, net	209,032
Other liabilities	7,116
Total liabilities assumed	468,605
Net assets acquired	2,925,027
Net cash purchase price	$ 2,889,629
Others [Member]
Business Acquisition, Contingent Consideration [Line Items]
Cash and cash equivalents			5,405
Accounts receivable			1,954
Current assets			419
Fixed assets			267
Intangible assets			22,172
Goodwill			36,328
Other assets			5,022
Total assets acquired			71,567
Current liabilities			3,437
Deferred revenues			2,801
Deferred income taxes, net			4,016
Other liabilities			4,717
Total liabilities assumed			14,971
Net assets acquired			56,596
Net cash purchase price			$ 51,191
Maplecroft [Member]
Business Acquisition, Contingent Consideration [Line Items]
Accounts receivable		$ 1,833
Current assets		543
Fixed assets		98
Intangible assets		13,270
Goodwill		21,369
Total assets acquired		37,113
Current liabilities		4,318
Deferred income taxes, net		2,654
Total liabilities assumed		6,972
Net assets acquired		30,141
Net cash purchase price		$ 30,141

Acquisitions - Amounts Assigned

Acquisitions - Amounts Assigned to Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 08, 2014	Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]
Weighted Average Useful Life	10 years
Total intangible assets	$ 13,270	$ 1,111,950
Technology-based [Member]
Business Acquisition, Contingent Consideration [Line Items]
Weighted Average Useful Life	10 years	7 years
Total intangible assets	$ 3,202	$ 104,663
Marketing-related [Member]
Business Acquisition, Contingent Consideration [Line Items]
Weighted Average Useful Life	10 years	20 years
Total intangible assets	$ 458	$ 232,935
Customer-related [Member]
Business Acquisition, Contingent Consideration [Line Items]
Weighted Average Useful Life	10 years	15 years
Total intangible assets	$ 9,610	$ 278,106
Database Rights [Member]
Business Acquisition, Contingent Consideration [Line Items]
Weighted Average Useful Life		20 years
Total intangible assets		$ 496,246

Acquisitions - Schedule of Unau

Acquisitions - Schedule of Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Pro forma revenues	$ 2,207,724	$ 2,121,241
Pro forma income from continuing operations	$ 507,416	$ 425,397
Pro forma basic income per share (in dollars per share)	$ 3.07	$ 2.57
Pro forma diluted income per share (in dollars per share)	$ 3.01	$ 2.52

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Thousands	Mar. 11, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from discontinued operations
Gain (loss) on sale of subsidiary		$ 0	$ 65,410	$ 0
Provision for income taxes (including tax on the gain on sale in 2014)		$ 0	(25,305)	(4,753)
Interthinx [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of subsidiary stock for sale	100.00%
Purchase price	$ 151,170
Revenues from discontinued operations
Revenues from discontinued operations			11,512	109,151
Income from discontinued operations before income taxes (including gain on sale of $65,410 in 2014)			54,482	10,819
Provision for income taxes (including tax on the gain on sale in 2014)			(25,305)	(4,753)
Income from discontinued operations, net of tax			$ 29,177	$ 6,066

Goodwill and Intangible Asset65

Goodwill and Intangible Assets - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill, beginning balance	[1]	$ 1,207,146	$ 1,181,681
Current year acquisitions		2,030,346	22,740
Purchase accounting reclassifications		1,589	2,725
Foreign currency translation adjustment		(104,255)
Goodwill, ending balance	[1]	3,134,826	1,207,146
Accumulated impairment charges				$ 3,244
Risk Assessment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	[1]	55,555	55,555
Current year acquisitions		0	0
Purchase accounting reclassifications		0	0
Foreign currency translation adjustment		0
Goodwill, ending balance	[1]	55,555	55,555
Decision Analytics [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	[1]	1,151,591	1,126,126
Current year acquisitions		2,030,346	22,740
Purchase accounting reclassifications		1,589	2,725
Foreign currency translation adjustment		(104,255)
Goodwill, ending balance	[1]	$ 3,079,271	$ 1,151,591
[1]	These balances are net of accumulated impairment charges of $3,244 that occurred prior to December 31, 2013.

Goodwill and Intangible Asset66

Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,840,041	$ 776,775
Accumulated Amortization	(463,296)	(370,299)
Total	$ 1,376,745	$ 406,476
Technology-based [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	8 years	8 years
Cost	$ 417,884	$ 299,705
Accumulated Amortization	(219,975)	(195,698)
Total	$ 197,909	$ 104,007
Marketing-related [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	16 years	5 years
Cost	$ 292,012	$ 71,504
Accumulated Amortization	(66,214)	(54,745)
Total	$ 225,798	$ 16,759
Contract-based [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	6 years	6 years
Cost	$ 6,555	$ 6,555
Accumulated Amortization	(6,555)	(6,555)
Total	$ 0	$ 0
Customer-related [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	13 years	13 years
Cost	$ 653,223	$ 399,011
Accumulated Amortization	(155,804)	(113,301)
Total	$ 497,419	$ 285,710
Database Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life	20 years
Cost	$ 470,367
Accumulated Amortization	(14,748)
Total	$ 455,619

Goodwill and Intangible Asset67

Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 120,523
2,017	119,616
2,018	118,870
2,019	117,410
2,020	115,955
2021 and thereafter	784,371
Total	$ 1,376,745	$ 406,476

Goodwill and Intangible Asset68

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill, impairment loss	$ 0	$ 0	$ 0
Purchase accounting reclassifications, change in goodwill	1,589,000	2,725,000
Purchase accounting reclassifications, change in fixed assets	355,000
Purchase accounting reclassifications, change in current liabilities	163,000
Purchase accounting adjustments	288,000
Intangible assets, purchase accounting adjustments	2,494,000
Purchase accounting reclassifications, change in deferred tax liabilities	1,001,000
Amortization of intangible assets	94,864,000	$ 56,870,000	$ 63,741,000
Maplecroft [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Purchase accounting reclassifications, change in goodwill	$ 1,589,000

Income Taxes - Domestic and For

Income Taxes - Domestic and Foreign Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S.	$ 605,777	$ 584,658	$ 532,933
Foreign	111,659	5,962	5,807
Income before income taxes	$ 717,436	$ 590,620	$ 538,740

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 181,536	$ 167,683	$ 134,014
State and local	25,565	26,333	18,764
Foreign	3,414	1,470	1,201
Total current provision for income taxes	210,515	195,486	153,979
Deferred:
Federal	21,969	27,220	37,894
State and local	1,671	(2,740)	4,287
Foreign	(24,296)	(211)	266
Total deferred provision for income taxes	(656)	24,269	42,447
Provision for income taxes	$ 209,859	$ 219,755	$ 196,426

Income Taxes - Effective Tax Ra

Income Taxes - Effective Tax Rate on Income from Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit	2.60%	2.70%	2.60%
Foreign tax differentials	(6.50%)	(0.10%)	(0.10%)
UK legislative change	(2.00%)	0.00%	0.00%
Other	0.20%	(0.40%)	(1.00%)
Effective tax rate for continuing operations	29.30%	37.20%	36.50%

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax asset:
Employee wages, pension and other benefits	$ 26,086	$ 29,756
Deferred revenue	0	1,835
Deferred rent	6,935	5,463
Net operating loss carryover	2,593	4,292
State tax adjustments	4,334	2,472
Capital and other unrealized losses	3,358	3,255
Other	11,193	4,956
Total	54,499	52,029
Less valuation allowance	(873)	(789)
Deferred income tax asset	53,626	51,240
Deferred income tax liability:
Fixed assets and intangible assets	(443,990)	(242,857)
Other	(6,066)	(6,151)
Deferred income tax liability	(450,056)	(249,008)
Deferred income tax liability, net	$ (396,430)	$ (197,768)

Income Taxes - Summary of Compa

Income Taxes - Summary of Company's Net Operating Loss Carryforwards Expires (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 56,566
2016-2023 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3,428
2024-2028 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	12,418
2029-2035 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 40,720

Income Taxes - Summary of Def74

Income Taxes - Summary of Deferred Income Tax Asset and Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current deferred income tax asset, net	$ 0	$ 4,772
Non-current deferred income tax liability, net	(396,430)	(202,540)
Deferred income tax liability, net	$ (396,430)	$ (197,768)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefit at January 1	$ 10,637	$ 9,524	$ 17,883
Gross increase in tax positions in prior period	7,137	2,679	541
Gross decrease in tax positions in prior period	(2,666)	0	(4,241)
Gross increase in tax positions from stock acquisitions	0	0	0
Settlements	(285)	0	(390)
Lapse of statute of limitations	(348)	(1,566)	(4,269)
Unrecognized tax benefit at December 31	$ 14,475	$ 10,637	$ 9,524

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Deferred tax liability	$ 396,430	$ 197,768
Unremitted earnings	102,837
Unrecognized tax benefits that would have a favorable effect on the Company's effective tax rate in any future periods	11,444	5,771	$ 4,658
The total gross amount of accrued interest and penalties	2,815	$ 2,818	$ 2,619
Significant change in unrecognized tax benefits is reasonably possible approximately	$ 472

Composition of Certain Financ77

Composition of Certain Financial Statement Captions - Schedule of Other Current Assets, Accounts Payable, Accrued Liabilities and Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other current assets:
Acquisition related escrows	$ 38,690	$ 5,583
Other current assets	14,262	13,292
Total other current assets	52,952	18,875
Accounts payable and accrued liabilities:
Accrued salaries, benefits and other related costs	101,259	87,729
Escrow liabilities	38,632	5,565
Trade accounts payable and other accrued expenses	105,773	87,432
Total accounts payable and accrued liabilities	245,664	180,726
Other liabilities:
Unrecognized tax benefits, including interest and penalty	17,290	13,455
Deferred rent	33,093	22,386
Other liabilities	9,715	7,547
Total other liabilities	$ 60,098	$ 43,388

Debt - Short-Term and Long-Term

Debt - Short-Term and Long-Term Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, current maturities	$ 874,811	$ 336,058
Capital lease obligations and other	2,317	5,026
Long-term debt	2,293,179	1,100,874
Total debt	$ 3,167,990	1,436,932
4.000% Senior Notes Due in 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	May 15, 2015
Debt instrument, maturity date	Jun. 15, 2025
Long-term debt	$ 895,468	0
Interest rate, stated percentage	4.00%
Unamortized discount on senior notes	$ 4,532	0
5.500% Senior Notes Due in 2045 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	May 15, 2015
Debt instrument, maturity date	Jun. 15, 2045
Long-term debt	$ 348,825	0
Interest rate, stated percentage	5.50%
Unamortized discount on senior notes	$ 1,175	0
4.125% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	Sep. 12, 2012
Debt instrument, maturity date	Sep. 12, 2022
Long-term debt	$ 348,140	347,863
Interest rate, stated percentage	4.125%
Unamortized discount on senior notes	$ 1,860	2,137
4.875% Senior Notes Due in 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	Dec. 8, 2011
Debt instrument, maturity date	Jan. 15, 2019
Long-term debt	$ 248,977	248,639
Interest rate, stated percentage	4.875%
Unamortized discount on senior notes	$ 1,023	1,361
5.80% Senior Notes Due in 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	Apr. 6, 2011
Debt instrument, maturity date	May 1, 2021
Long-term debt	$ 449,452	449,346
Interest rate, stated percentage	5.80%
Unamortized discount on senior notes	$ 548	654
Prudential Senior Notes [Member] | 5.84% Series H Shelf Notes Due October 2015 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 26, 2015
Interest rate, stated percentage	5.84%
Prudential Senior Notes [Member] | 6.28% Senior I Shelf Notes Due April 2015 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 29, 2015
Interest rate, stated percentage	6.28%
Prudential Senior Notes [Member] | 6.85% Series J Senior Notes Due in 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date	Jun. 15, 2009
Debt instrument, maturity date	Jun. 15, 2016
Long-term debt	$ 0	50,000
Interest rate, stated percentage	6.85%
New York Life Senior Notes [Member] | 5.87% Series A Shelf Notes Due October 2015 [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 0	17,500
Debt instrument, issuance date	Oct. 26, 2007
Debt instrument, maturity date	Oct. 26, 2015
Interest rate, stated percentage	5.87%
New York Life Senior Notes [Member] | 6.35% Series B Shelf Notes Due in 2015 [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 0	50,000
Debt instrument, issuance date	Apr. 29, 2008
Debt instrument, maturity date	Apr. 29, 2015
Interest rate, stated percentage	6.35%
Line of Credit [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 870,000	160,000
Prudential Senior Notes [Member] | 5.84% Series H Shelf Notes Due October 2015 [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 0	17,500
Debt instrument, issuance date	Oct. 26, 2007
Debt instrument, maturity date	Oct. 26, 2015
Prudential Senior Notes [Member] | 6.28% Senior I Shelf Notes Due April 2015 [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 0	85,000
Debt instrument, issuance date	Apr. 29, 2008
Debt instrument, maturity date	Apr. 29, 2015
Capital lease obligations and other [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 4,811	$ 6,058

Debt - Additional Information (

Debt - Additional Information (Detail)	May. 15, 2015USD ($)	May. 14, 2015USD ($)	Apr. 29, 2015USD ($)	Mar. 10, 2015USD ($)	Dec. 31, 2015USD ($)fiscal_quarter	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Apr. 22, 2015USD ($)
Debt Instrument [Line Items]
Accrued interest					$ 18,584,000	$ 16,265,000
Interest expense					121,316,000	69,984,000	$ 76,136,000
Long-term debt, gross					$ 2,300,000,000	1,050,000,000
Number of quarters | fiscal_quarter					4
Short-term debt and current portion of long-term debt					$ 874,811,000	336,058,000
Proceeds from short-term debt, net					(105,000,000)	160,000,000	(10,000,000)
Bridge loan				$ 2,300,000,000
Interest Expense [Member]
Debt Instrument [Line Items]
Repayments of debt					4,786,000
Cash [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 25,000,000	$ 55,000,000
Bridge Loan [Member]
Debt Instrument [Line Items]
Interest expense					9,100,000
Debt instrument, term (in days)				364 days
Private Placement [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt					0
Line of Credit [Member]
Debt Instrument [Line Items]
Fair value of amount outstanding					870,000,000	160,000,000
Wood Mackenzie [Member]
Debt Instrument [Line Items]
Proceeds from lines of credit					$ 930,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 1,750,000,000
Interest coverage ratio					3
Leverage ratio, first four fiscal quarters					3.75
Leverage ratio, subsequent to first four fiscal quarters					3.5
Repayments of debt		60,000,000	80,000,000
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					1.125%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					1.625%
Loan commitment fee [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					0.125%
Loan commitment fee [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					0.25%
Subsequent Event [Member]
Debt Instrument [Line Items]
Repayments of debt					$ 165,000,000
Old Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 990,000,000
4.000% Notes [Member]
Debt Instrument [Line Items]
Bond issuance, aggregate principal amount	$ 900,000,000
Interest rate, stated percentage	4.00%
Unamortized discount on senior notes	$ 4,833,000
Debt issuance cost	7,560,000
5.500% Notes [Member]
Debt Instrument [Line Items]
Bond issuance, aggregate principal amount	$ 350,000,000
Interest rate, stated percentage	5.50%
Unamortized discount on senior notes	$ 1,201,000
Debt issuance cost	$ 4,138,000
6.28% Senior I Shelf Notes Due April 2015 [Member] | Prudential Senior Notes [Member]
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt		50,000,000
Proceeds from short-term debt, net			85,000,000
6.35% Series B Shelf Notes Due in 2015 [Member] | New York Life Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from short-term debt, net			$ 50,000,000
Long-term Debt [Member]
Debt Instrument [Line Items]
Interest expense					$ 121,316,000	$ 69,984,000	$ 76,136,000
New York Life Senior Notes [Member] | 6.35% Series B Shelf Notes Due in 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					6.35%
New York Life Senior Notes [Member] | 5.87% Series A Shelf Notes Due October 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					5.87%
Short-term debt and current portion of long-term debt		17,500,000
Prudential Senior Notes [Member] | 6.28% Senior I Shelf Notes Due April 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					6.28%
Prudential Senior Notes [Member] | 5.84% Series H Shelf Notes Due October 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage					5.84%
Short-term debt and current portion of long-term debt		$ 17,500,000

Debt - Summary of Long Term Deb

Debt - Summary of Long Term Debt Maturities (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Debt Disclosure [Abstract]
2,016	$ 874,811
2,017	1,411
2,018	618
2,019	250,210
2,020	48
2021 and thereafter	2,050,030
Total	$ 3,177,128

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	May. 12, 2015USD ($)$ / shares	Jun. 30, 2015shares	Dec. 31, 2014USD ($)$ / sharesshares	Jun. 30, 2015shares	Sep. 30, 2015shares	Dec. 31, 2015USD ($)boardmember$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)shares	Dec. 01, 2015USD ($)
Class of Stock [Line Items]
Common stock authorized (in shares)			1,200,000,000			2,000,000,000	1,200,000,000
Board members | boardmember						12
Authorized preferred stock						80,000,000
Preferred stock par value per share (in dollars per share) | $ / shares						$ 0.001
Proceeds from issuance of stock as part of a public offering | $	$ 721,867,000					$ 720,848,000	$ 0	$ 0
Underwriting discount | $	$ 20,413,000
Stock issued during period, acquisitions (in shares)					10,604,000	10,604,000	0	0
Equity offering price (in dollars per share) | $ / shares	$ 68.075
Payment of financing and stock issuance costs | $	$ 1,019,000
Share repurchase program, authorized capacity | $						$ 2,300,000,000
Treasury stock, cumulative value, acquired, cost method | $						1,830,649,000
Available shares for repurchase | $						$ 469,351,000
Treasury stock, shares acquired						279,453	10,802,087
Treasury stock (in shares)			386,089,811			374,578,057	386,089,811
Reissued of common stock, shares						12,600,228	1,257,387
Weighted average price per share (in dollars per share) | $ / shares			$ 5.29			$ 6.59	$ 5.29
Common stock shares excluded from diluted EPS						1,221,301	1,633,670	656,499
Verisk Class A [Member]
Class of Stock [Line Items]
Share repurchase program, authorized capacity | $			$ 500,000,000				$ 500,000,000		$ 300,000,000
Treasury stock, shares acquired						1,088,474	10,802,087	4,532,552
Weighted average repurchase price of shares (in dollars per share) | $ / shares						$ 73.20	$ 62.53
Treasury stock (in shares)						374,578,057
Accelerated Stock Repurchase [Member]
Class of Stock [Line Items]
Treasury stock, shares acquired		809,021	6,372,472	7,181,493

Stockholders' Equity - Computat

Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Income from continuing operations	$ 507,577	$ 370,865	$ 342,314
Income from discontinued operations	0	29,177	6,066
Net income	$ 507,577	$ 400,042	$ 348,380
Denominator:
Weighted average number of common shares used in basic EPS (in shares)	165,090,380	165,823,803	168,031,412
Effect of dilutive shares:
Potential common stock issuable from stock options and stock awards (in shares)	3,360,963	3,308,620	4,244,948
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares)	168,451,343	169,132,423	172,276,360

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Accumulated Other Comprehensive Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Foreign currency translation adjustment	$ (165,828)	$ (3,086)
Unrealized gains (losses) on available-for-sale securities, net of tax	3	(110)
Pension and postretirement adjustment, net of tax	(76,227)	(77,318)
Accumulated other comprehensive losses	$ (242,052)	$ (80,514)

Stockholders' Equity - Other Co

Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Before Tax
Foreign currency translation adjustment		$ (162,742)	$ (1,286)	$ (840)
Unrealized holding gain on available-for-sale securities before reclassifications		398	(314)	(1,122)
Amount reclassified from accumulated other comprehensive loss	[1]	(200)	257	882
Unrealized holding gain on available-for-sale securities		198	(57)	(240)
Pension and postretirement adjustment before reclassifications		5,197	(56,635)	80,773
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	[2]	(3,242)	(1,134)	(5,699)
Pension and postretirement adjustment		1,955	(57,769)	75,074
Total other comprehensive income (loss)		(160,589)	(59,112)	73,994
Tax Benefit (Expense)
Foreign currency translation adjustment		0	0	0
Unrealized holding gain on available-for-sale securities before reclassifications		(162)	121	433
Amount reclassified from accumulated other comprehensive loss	[1]	77	(99)	(340)
Unrealized holding gain on available-for-sale securities		(85)	22	93
Pension and postretirement adjustment before reclassifications		(2,105)	21,629	(30,611)
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	[2]	1,241	435	2,196
Pension and postretirement adjustment		(864)	22,064	(28,415)
Total other comprehensive income (loss)		(949)	22,086	(28,322)
After Tax
Foreign currency translation adjustment		(162,742)	(1,286)	(840)
Unrealized holding gain on available-for-sale securities before reclassifications		236	(193)	(689)
Amount reclassified from accumulated other comprehensive loss	[1]	(123)	158	542
Unrealized holding gain on available-for-sale securities		113	(35)	(147)
Pension and postretirement adjustment before reclassifications		3,092	(35,006)	50,162
Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses	[2]	(2,001)	(699)	(3,503)
Pension and postretirement adjustment		1,091	(35,705)	46,659
Total other comprehensive (loss) income		$ (161,538)	$ (37,026)	$ 45,672
[1]	This accumulated other comprehensive losses component, before tax, is included under “Investment income and others” in the accompanying consolidated statements of operations.
[2]	This accumulated other comprehensive losses component, before tax, is included under “Cost of revenues” and “Selling, general and administrative” in the accompanying consolidated statements of operations. This component is also included in the computation of net periodic benefit (credit) cost (see Note 17 Pension and Postretirement Benefits for additional details).

Compensation Plans - Additional

Compensation Plans - Additional Information (Detail)	Jul. 01, 2015shares	Apr. 01, 2015shares	Sep. 30, 2015shares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / sharesshares	May. 15, 2013shares	Dec. 31, 2012USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net share settlement from restricted stock awards				$ 2,350,000	$ 1,625,000
Cash contributions to ESOP				0	$ 0	$ 0
Required contribution to new loan agreement				$ 17,000,000
Common stock shares fair value (in dollars per share) | $ / shares				$ 76.88	$ 64.05	$ 65.72
No of allocated shares | shares				0
Number of service hours				1000 hours
Restricted stock service vesting period (in years)				4 years
Profit sharing contributions				$ 0	$ 0	$ 0
KSOP compensation expense				30,542,000	20,253,000	21,087,000
Cash received from stock option exercised				$ 38,831,000	$ 24,648,000	$ 80,368,000
Stock options granted (in shares) | shares				1,884,262	1,242,428	888,038
Nonqualified stock option contractual term				10 years
Aggregate intrinsic value of stock option outstanding				$ 334,691,000	$ 303,267,000	$ 360,611,000		$ 361,653,000
Aggregate intrinsic value of stock option exercisable				307,924,000	286,728,000
Excess tax benefit from stock option exercised				29,230,000	15,988,000	58,056,000
Realized tax benefit from stock option exercised				$ 40,147,000	$ 22,566,000	$ 109,946,000
Number of stock issued during period shares stock options exercised net of taxes | shares				32,882	27,159	0
Total unrecognized compensation cost related to nonvested share based compensation arrangements				$ 53,536,000
Unrecognized compensation cost weighted average period				2 years 7 months 28 days
Non vested stock option | shares				2,576,504
Stock option expected to vest | shares				2,125,711
Total fair value of options vested				$ 16,780,000	$ 12,780,000	$ 16,468,000
Grant date fair value restricted stock vested				$ 16,316,000	9,839,000	$ 7,153,000
Authorized payroll deductions on base salary				20.00%
Maximum payroll deductions on short-term incentive compensation				50.00%
Maximum amount of payroll deductions				$ 25,000
Purchase discount				5.00%
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net share settlement from restricted stock awards				$ 2,350,000	$ 1,625,000
Verisk Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class A common stock reserved | shares							15,700,000
Basis to reduce shares authorized for shares issued subject to option or stock appreciation rights							1
Basis to reduce shares authorized for shares issued subject to awards other than option or stock appreciation rights							2.5
Common stock, shares issued | shares				10,351,157
Ksop [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period | shares				47,686	0	0
Shares of Verisk Class A common stock issued, discounted price per share | $ / shares				$ 77.51
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period | shares				25,599	26,953	27,879
Shares of Verisk Class A common stock issued, discounted price per share | $ / shares				$ 70.27	$ 57.98	$ 59.62
Ksop [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax contribution of compensation				$ 18,000	$ 18,000	$ 18,000
Minimum participant age, additional employee contributions				50 years
Contributions of additional pre-tax basis				$ 6,000	6,000	6,000
After tax contribution are limited for compensation				10.00%
Matching contributions in Class A common stock				75.00%
Matching contributions initial in Class A common stock				6.00%
KSOP compensation expense				$ 14,076,000	$ 15,351,000	$ 14,930,000
Stock Options [Member] | Key Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares) | shares	0	0	1,884,262
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock service vesting period (in years)				4 years
Restricted stock granted (in shares) | shares				350,004	246,003	241,674
Non vested stock option | shares				531,278
Stock option expected to vest | shares				441,089
Restricted Stock [Member] | Key Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares) | shares	0	0	350,004

Compensation Plans Compensation

Compensation Plans Compensation Plans - Summary of Equity Awards (Details) - shares

Nov. 09, 2015

Aug. 24, 2015

Aug. 10, 2015

Aug. 03, 2015

Jul. 13, 2015

Jul. 08, 2015

Jul. 01, 2015

May. 19, 2015

Apr. 01, 2015

Sep. 30, 2015

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

1,884,262

1,242,428

888,038

Common stock issued (in shares)

1,739,847

1,091,746

4,076,750

Stock Options [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

0

0

1,884,262

Stock Options [Member] | Immediate Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

255,473

Stock Options [Member] | Immediate Vesting [Member] | Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

27,047

Stock Options [Member] | One-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

51,876

Stock Options [Member] | Four-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

127,931

Stock Options [Member] | Four-year Graded Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock options granted (in shares)

5,615

3,737

1,776

927

1,304

3,778

2,244

225,363

1,177,191

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

350,004

246,003

241,674

Common stock issued (in shares)

177,252

134,713

150,668

Restricted Stock [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

0

0

350,004

Restricted Stock [Member] | Immediate Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

52,960

Restricted Stock [Member] | Immediate Vesting [Member] | Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

1,131

Restricted Stock [Member] | One-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

9,988

Restricted Stock [Member] | Four-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

28,445

Restricted Stock [Member] | Four-year Graded Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock granted (in shares)

1,107

691

335

173

244

692

418

42,064

211,756

Common Stock [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

3,873

840

4,713

Common Stock [Member] | Immediate Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

0

Common Stock [Member] | Immediate Vesting [Member] | Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

0

Common Stock [Member] | One-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

0

Common Stock [Member] | Four-year Cliff Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

0

Common Stock [Member] | Four-year Graded Vesting [Member] | Key Employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common stock issued (in shares)

0

0

0

0

0

0

0

0

0

April 1, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

May 19, 2015 [Member] | Four-year Cliff Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

May 19, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

July 1, 2015 [Member] | One-year Cliff Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

1 year

July 1, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

July 8, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

July 13, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

August 3, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

August 10, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

August 24, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

November 9, 2015 [Member] | Four-year Graded Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Award Contractual Term

4 years

Compensation Plans - Fair Value

Compensation Plans - Fair Value of Stock Options Granted Using Black- Scholes Valuation Model (Detail) - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	19.51%	20.53%	29.27%
Risk-free interest rate	1.29%	1.48%	0.70%
Expected term in years	4 years 6 months	4 years 5 months	4 years 6 months
Dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value per stock option (in dollars per share)	$ 13.58	$ 11.86	$ 15.58

Compensation Plans - Options Ou

Compensation Plans - Options Outstanding Under Incentive Plan and Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Options
Number of options outstanding, beginning balance (in shares)	9,205,690	9,235,320	12,573,298
Number of options granted (in shares)	1,884,262	1,242,428	888,038
Number of options, exercised (in shares)	(1,739,847)	(1,091,746)	(4,076,750)
Number of options, canceled or expired (in shares)	(232,372)	(180,312)	(149,266)
Number of options outstanding, ending balance (in shares)	9,117,733	9,205,690	9,235,320
Number of options exercisable (in shares)	6,541,229	7,159,895
Weighted Average Exercise Price Per Share
Weighted average exercise price per share, beginning balance (in dollars per share)	$ 31.11	$ 26.67	$ 22.21
Weighted average exercise price per share, granted (in dollars per share)	72.20	59.83	61.10
Weighted average exercise price per share , exercised (in dollars per share)	23.71	22.29	19.79
Weighted average exercise price per share, canceled or expired (in dollars per share)	64.05	55.23	43.14
Weighted average exercise price per share, ending balance (in dollars per share)	40.17	31.11	$ 26.67
Weighted average exercise price, options exercisable (in dollars per share)	$ 29.81	$ 24
Options, Additional Disclosures
Aggregate intrinsic value option outstanding, beginning balance	$ 303,267	$ 360,611	$ 361,653
Aggregate intrinsic value, exercised	87,008	43,863	168,056
Aggregate intrinsic value option outstanding, ending balance	334,691	303,267	$ 360,611
Aggregate intrinsic value of stock option exercisable	$ 307,924	$ 286,728

Compensation Plans - Summary of

Compensation Plans - Summary of Nonvested Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Options
Number of options outstanding, beginning balance (in shares)	9,205,690	9,235,320	12,573,298
Number of options granted (in shares)	1,884,262	1,242,428	888,038
Number of options, canceled or expired (in shares)	(232,372)	(180,312)	(149,266)
Number of options outstanding, ending balance (in shares)	9,117,733	9,205,690	9,235,320
Non Vested Options [Member]
Number of Options
Number of options outstanding, beginning balance (in shares)	2,045,795	2,066,231	3,776,302
Number of options granted (in shares)	1,884,262	1,242,428	888,038
Number of options, vested (in shares)	(1,121,181)	(1,082,552)	(2,448,843)
Number of options, canceled or expired (in shares)	(232,372)	(180,312)	(149,266)
Number of options outstanding, ending balance (in shares)	2,576,504	2,045,795	2,066,231
Weighted Average Grant-Date Fair Value Per Share
Weighted average grant-date fair value per share, nonvested beginning balance (in dollars per share)	$ 12.55	$ 12.61	$ 9.43
Weighted average grant-date fair value per share, granted (in dollars per share)	13.58	11.86	15.58
Weighted average grant-date fair value per share, vested (in dollars per share)	13.24	11.71	8.81
Weighted average grant-date fair value per share, cancelled or expired (in dollars per share)	13.05	13.56	12.18
Weighted average grant-date fair value per share, nonvested ending balance (in dollars per share)	$ 12.95	$ 12.55	$ 12.61

Compensation Plans - Summary 90

Compensation Plans - Summary of Restricted Stock Activity Under Incentive Plan (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Number of shares, outstanding beginning balance	442,310	396,749	331,013
Number of shares, granted	350,004	246,003	241,674
Number of shares, vested	(211,265)	(163,280)	(150,668)
Number of shares, forfeited	(47,281)	(37,162)	(25,270)
Number of shares, outstanding ending balance	533,768	442,310	396,749
Weighted Average Grant Date Fair Value Per Share
Weighted average grant-date fair value per share, outstanding, beginning balance (in dollars per share)	$ 56.84	$ 52.82	$ 42.78
Weighted average grant-date fair value per share, granted (in dollars per share)	72.24	59.86	61.12
Weighted average grant-date fair value per share, vested (in dollars per share)	58.64	49.94	37.82
Weighted average grant-date fair value per share, forfeited (in dollars per share)	63.10	55.53	53
Weighted average grant-date fair value per share, outstanding, ending balance (in dollars per share)	$ 66.25	$ 56.84	$ 52.82

Pension and Postretirement Be91

Pension and Postretirement Benefits - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate			8.50%
Decreased healthcare cost trend rate			5.00%
Change in assumed healthcare cost trend rates			1.00%
Reduction in accumulated postretirement benefit obligation for subsidy			$ 2,453,000	$ 3,182,000
Effect of subsidy on net periodic postretirement benefit cost			$ 7,000	$ 10,000	$ 19,000
Expected return on plan assets			7.50%	7.50%
Fair value, assets, level 2 to level 1 transfers, amount			$ 142,117,000
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation of securities			60.00%
Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation of securities			40.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Domestic equity portion of portfolio			40.00%
Minimum [Member] | Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
International equity portion of portfolio			10.00%
Minimum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed income portion of portfolio			20.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Domestic equity portion of portfolio			60.00%
Maximum [Member] | Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
International equity portion of portfolio			20.00%
Maximum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed income portion of portfolio			40.00%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Voluntary prefunding to defined benefit plan	$ 72,000,000
Minimum contribution requirement to defined benefit plan for 2013			$ 0
Estimated future employer contributions in next fiscal year			$ 0
Target investment allocation of securities			100.00%
Actual plan asset allocation			100.00%	100.00%
Pension Plan And Supplemental Cash Balance Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution to defined benefit plan			$ 970,000	$ 1,177,000
Estimated future employer contributions in next fiscal year			971,000
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution to defined benefit plan			(396,000)	$ (305,000)
Estimated future employer contributions in next fiscal year			$ 879,000
Expected return on plan assets			4.00%	5.00%	5.00%
VEBA Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation			100.00%
VEBA Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation of securities		100.00%

Pension and Postretirement Be92

Pension and Postretirement Benefits - Summary of Changes in Benefit Obligations and Plan Assets Amount Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in plan assets:
Fair value of plan assets at January 1	$ 490,512
Fair value of plan assets at December 31	451,652	$ 490,512
Pension assets, noncurrent	(32,922)	(18,589)
Pension Plan and SERP Plan [Member]
Change in benefit obligation:
Benefit obligation at January 1	471,259	420,664
Interest cost	18,102	19,073	$ 17,860
Actuarial loss (gain)	(44,159)	61,804
Plan amendments	3,830	0
Plan participants’ contributions	0	0
Benefits paid	(29,406)	(30,282)
Federal subsidy on benefits paid	0	0
Benefit obligation at December 31	419,626	471,259	420,664
Accumulated benefit obligation at December 31	419,626	471,259
Change in plan assets:
Fair value of plan assets at January 1	475,281	467,912
Actual return on plan assets, net of expenses	(8,220)	36,474
Employer contributions, net	970	1,177
Plan participants’ contributions	0	0
Benefits paid	(29,406)	(30,282)
Federal subsidy on benefits paid	0	0
Fair value of plan assets at December 31	438,625	475,281	467,912
(Funded) unfunded status at December 31	(18,999)	(4,022)
Pension assets, noncurrent	(32,922)	(18,589)
Pension, SERP and postretirement benefits, current	952	762
Pension, SERP and postretirement benefits, noncurrent	12,971	13,805
Total Pension, SERP and Postretirement benefits	(18,999)	(4,022)
Postretirement Plan [Member]
Change in benefit obligation:
Benefit obligation at January 1	18,773	20,399
Interest cost	520	593	608
Actuarial loss (gain)	(1,584)	(411)
Plan amendments	0	0
Plan participants’ contributions	1,903	2,635
Benefits paid	(4,464)	(4,834)
Federal subsidy on benefits paid	739	391
Benefit obligation at December 31	15,887	18,773	20,399
Change in plan assets:
Fair value of plan assets at January 1	15,231	16,601
Actual return on plan assets, net of expenses	14	743
Employer contributions, net	(396)	(305)
Plan participants’ contributions	1,903	2,635
Benefits paid	(4,464)	(4,834)
Federal subsidy on benefits paid	739	391
Fair value of plan assets at December 31	13,027	15,231	$ 16,601
(Funded) unfunded status at December 31	2,860	3,542
Pension assets, noncurrent	0	0
Pension, SERP and postretirement benefits, current	879	1,132
Pension, SERP and postretirement benefits, noncurrent	1,981	2,410
Total Pension, SERP and Postretirement benefits	$ 2,860	$ 3,542

Pension and Postretirement Be93

Pension and Postretirement Benefits - Summary of Pre-Tax Components of Accumulated Other Comprehensive Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension Plan and SERP Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service benefit	$ 3,830	$ 0
Actuarial losses	116,400	120,735
Accumulated other comprehensive losses, pretax	120,230	120,735
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service benefit	(854)	(1,000)
Actuarial losses	6,725	8,321
Accumulated other comprehensive losses, pretax	$ 5,871	$ 7,321

Pension and Postretirement Be94

Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive loss (income)	$ (1,955)	$ 57,769	$ (75,074)
Pension Plan and SERP Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	18,102	19,073	17,860
Expected return on plan assets	(34,432)	(33,942)	(30,480)
Amortization of prior service benefit	0	0	0
Amortization of net actuarial loss	2,828	763	5,078
Net periodic benefit (credit) cost	(13,502)	(14,106)	(7,542)
Amortization of actuarial loss reclassified from accumulated other comprehensive losses	(174)	(354)	(1,320)
Amortization of prior service benefit reclassified from accumulated other comprehensive losses	0	0	0
Net loss recognized reclassified from accumulated other comprehensive losses	(2,653)	(409)	(3,758)
Plan amendments	3,830	0	0
Actuarial gain (loss)	(1,508)	59,272	(70,065)
Total recognized in other comprehensive loss (income)	(505)	58,509	(75,143)
Total recognized in net periodic benefit (credit) cost and other comprehensive loss (income)	(14,007)	44,403	(82,685)
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	520	593	608
Expected return on plan assets	(563)	(786)	(919)
Amortization of prior service benefit	(146)	(146)	(146)
Amortization of net actuarial loss	560	517	767
Net periodic benefit (credit) cost	371	178	310
Amortization of actuarial loss reclassified from accumulated other comprehensive losses	0	0	0
Amortization of prior service benefit reclassified from accumulated other comprehensive losses	146	146	146
Net loss recognized reclassified from accumulated other comprehensive losses	0	0	0
Plan amendments	0	0	0
Actuarial gain (loss)	(1,596)	(886)	(77)
Total recognized in other comprehensive loss (income)	(1,450)	(740)	69
Total recognized in net periodic benefit (credit) cost and other comprehensive loss (income)	$ (1,079)	$ (562)	$ 379

Pension and Postretirement Be95

Pension and Postretirement Benefits - Summary of Accumulated Other Comprehensive Losses Recognized in Net Periodic Benefit (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ 17
Amortization of net actuarial loss	3,523
Total	3,540
Pension Plan and SERP Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	163
Amortization of net actuarial loss	3,017
Total	3,180
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(146)
Amortization of net actuarial loss	506
Total	$ 360

Pension and Postretirement Be96

Pension and Postretirement Benefits - Summary of Weighted-Average Assumptions Used in Calculating Net Periodic Benefit (Credit) Cost (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted-average assumptions used to determine net periodic benefit (credit) loss:
Expected return on plan assets	7.50%	7.50%
Pension Plan and SERP Plan [Member]
Weighted-average assumptions used to determine benefit obligations:
Discount rate	4.73%	3.99%
Expected return on plan assets	7.50%	7.50%
Weighted-average assumptions used to determine net periodic benefit (credit) loss:
Discount rate	3.99%	4.73%	3.98%
Expected return on plan assets	7.50%	7.50%	7.50%
Postretirement Plan [Member]
Weighted-average assumptions used to determine benefit obligations:
Discount rate	3.25%	3.00%
Expected return on plan assets	4.00%	4.00%
Weighted-average assumptions used to determine net periodic benefit (credit) loss:
Discount rate	3.00%	3.45%	2.75%
Expected return on plan assets	4.00%	5.00%	5.00%

Pension and Postretirement Be97

Pension and Postretirement Benefits - Summary of Estimated Future Benefit Payments for Respective Plans (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Pension Plan and SERP Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Gross benefit amount, 2016	$ 30,037
Gross benefit amount, 2017	30,157
Gross benefit amount, 2018	29,751
Gross benefit amount, 2019	30,046
Gross benefit amount, 2020	29,791
Gross benefit amount, 2021-2025	145,032
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Gross benefit amount, 2016	2,583
Medicare subsidy payments, 2016	(365)
Net benefit amount, 2016	2,218
Gross benefit amount, 2017	2,401
Medicare subsidy payments, 2017	(354)
Net benefit amount, 2017	2,047
Gross benefit amount, 2018	2,207
Medicare subsidy payments, 2018	(344)
Net benefit amount, 2018	1,863
Gross benefit amount, 2019	2,003
Medicare subsidy payments, 2019	(332)
Net benefit amount, 2019	1,671
Gross benefit amount, 2020	1,803
Medicare subsidy payments, 2020	(319)
Net benefit amount, 2020	1,484
Gross benefit amount, 2021-2025	6,276
Medicare subsidy payments, 2021-2025	(963)
Net benefit amount, 2021-2025	$ 5,313

Pension and Postretirement Be98

Pension and Postretirement Benefits - Summary of Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Compensation and Retirement Disclosure [Abstract]
Effect of total service and interest cost components of net periodic postretirement healthcare benefit cost, 1% Increase	$ 13
Effect on the healthcare component of the accumulated postretirement benefit obligation, 1% Increase	394
Effect of total service and interest cost components of net periodic postretirement healthcare benefit cost, 1% Decrease	(12)
Effect on the healthcare component of the accumulated postretirement benefit obligation, 1% Decrease	$ (366)

Pension and Postretirement Be99

Pension and Postretirement Benefits - Summary of Asset Allocation and Target Allocation (Detail) - Pension Plan [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%
Summary of asset allocation and target allocation
Percentage of Plan Assets	100.00%	100.00%
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%
Summary of asset allocation and target allocation
Percentage of Plan Assets	60.00%	56.80%
Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	40.00%
Summary of asset allocation and target allocation
Percentage of Plan Assets	39.60%	41.30%
Other Asset Category [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Summary of asset allocation and target allocation
Percentage of Plan Assets	0.40%	1.90%

Pension and Postretirement B100

Pension and Postretirement Benefits - Summary of Fair Value Measurements of Pension Plan Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 451,652	$ 490,512
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		228,664	98,921
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		222,774	391,351
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		214	240	$ 635
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	215,637	83,690
Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	215,637	83,690
Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	0	0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	0	0
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	47,314	186,102
Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0	0
Equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	47,314	186,102
Equity securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0	0
Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	214	240
Equity Partnerships [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	0	0
Equity Partnerships [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	0	0
Equity Partnerships [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	214	240
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	173,641	196,034
Fixed Income Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0	0
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	173,641	196,034
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0	0
US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	13,027	15,231
US Treasury and Government [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	13,027	15,231
US Treasury and Government [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	0	0
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	0	0
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	1,819	9,215
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0	0
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	1,819	9,215
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	$ 0	$ 0
[1]	Valued at the closing price of shares for domestic stocks within the managed equity accounts, and valued at the net asset value (“NAV”) of shares for mutual funds at either the closing price reported in the active market or based on yields currently available on comparable securities of issuers with similar credit ratings for corporate bonds held by the Pension Plan in these managed accounts.
[2]	The pooled separate accounts invest in domestic and foreign stocks, bonds and mutual funds. The fair values of these stocks, bonds and mutual funds are publicly quoted and are used in determining the NAV of the pooled separate account, which is not publicly quoted.
[3]	Investments for which readily determinable prices do not exist are valued by the General Partner using either the market or income approach. In establishing the estimated fair value of investments, including those without readily determinable values, the General Partner assumes a reasonable period of time for liquidation of the investment, and takes into consideration the financial condition and operating results of the underlying portfolio company, nature of investment, restrictions on marketability, holding period, market conditions, foreign currency exposures, and other factors the General Partner deems appropriate.
[4]	The fund invested in the U.S. government, its agencies or instrumentalities or securities that are rated AAA by S&P, AAA by Fitch, or Aaa by Moody’s, including but not limited to mortgage securities such as agency and non-agency collateralized mortgage obligations, and other obligations that are secured by mortgages or mortgage backed securities, and valued at the closing price reported in the active market.

Pension and Postretirement B101

Pension and Postretirement Benefits - Summary of Changes in Fair Value of Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	$ 490,512
Fair value of plan assets at December 31	451,652	$ 490,512
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	240	635
Realized and unrealized loss on plan assets, net	(26)	(395)
Fair value of plan assets at December 31	$ 214	$ 240

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Countrysegment	Dec. 31, 2014Customer	Dec. 31, 2013Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of customers | Customer		0	0
Number of operating segments	2
Number of reportable segments	2
Number of countries in which entity operates (in countries) | Country	0
Geographic Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percent	10.00%	10.00%	10.00%
Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percent		10.00%	10.00%

Segment Reporting - Reconciliat

Segment Reporting - Reconciliation Income Before Income Taxes (Detail) - USD ($) $ in Thousands	May. 19, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues		$ 2,068,010	$ 1,746,726	$ 1,595,703
Expenses:
Cost of revenues (exclusive of items shown separately below)		(803,274)	(716,598)	(622,523)
Selling, general and administrative		(312,690)	(227,306)	(228,982)
Investment income and others, net		17,003	158	609
EBITDA from discontinued operations		0	55,588	15,466
Gain on derivative instruments	$ 85,187	85,187	0	0
EBITDA		1,054,236	858,568	760,273
Depreciation and amortization of fixed assets		(120,620)	(85,506)	(66,190)
Amortization of intangible assets		(94,864)	(56,870)	(63,741)
Investment income and others, net		(17,003)	(158)	(609)
EBITDA from discontinued operations		0	(55,588)	(15,466)
Gain on derivative instruments	$ (85,187)	(85,187)	0	0
Operating income		736,562	660,446	614,267
Interest expense		(121,316)	(69,984)	(76,136)
Income before income taxes		717,436	590,620	538,740
Decision Analytics [Member]
Segment Reporting Information [Line Items]
Revenues		1,379,819	1,096,074	977,427
Expenses:
Cost of revenues (exclusive of items shown separately below)		(603,309)	(508,411)	(427,978)
Selling, general and administrative		(230,844)	(153,453)	(151,557)
Investment income and others, net		16,885	0	(16)
EBITDA from discontinued operations		0	55,588	15,466
Gain on derivative instruments		85,187	0	0
EBITDA		647,738	489,798	413,342
Depreciation and amortization of fixed assets		(94,834)	(64,826)	(51,739)
Amortization of intangible assets		(94,511)	(56,517)	(63,388)
Investment income and others, net		(16,885)	0	16
EBITDA from discontinued operations		0	(55,588)	(15,466)
Gain on derivative instruments		(85,187)	0	0
Operating income		356,321	312,867	282,765
Risk Assessment [Member]
Segment Reporting Information [Line Items]
Revenues		688,191	650,652	618,276
Expenses:
Cost of revenues (exclusive of items shown separately below)		(199,965)	(208,187)	(194,545)
Selling, general and administrative		(81,846)	(73,853)	(77,425)
Investment income and others, net		118	158	625
EBITDA from discontinued operations		0	0	0
Gain on derivative instruments		0	0	0
EBITDA		406,498	368,770	346,931
Depreciation and amortization of fixed assets		(25,786)	(20,680)	(14,451)
Amortization of intangible assets		(353)	(353)	(353)
Investment income and others, net		(118)	(158)	(625)
EBITDA from discontinued operations		0	0	0
Gain on derivative instruments		0	0	0
Operating income		$ 380,241	$ 347,579	$ 331,502

Segment Reporting - Operating S

Segment Reporting - Operating Segment Revenue by Type of Service (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 2,068,010	$ 1,746,726	$ 1,595,703
Decision Analytics [Member]
Segment Reporting Information [Line Items]
Revenues	1,379,819	1,096,074	977,427
Decision Analytics [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Revenues	647,161	598,757	539,150
Decision Analytics [Member] | Financial services [Member]
Segment Reporting Information [Line Items]
Revenues	116,556	96,763	81,113
Decision Analytics [Member] | Healthcare [Member]
Segment Reporting Information [Line Items]
Revenues	307,291	315,628	271,538
Decision Analytics [Member] | Energy and Specialized Markets [Member]
Segment Reporting Information [Line Items]
Revenues	308,811	84,926	85,626
Risk Assessment [Member]
Segment Reporting Information [Line Items]
Revenues	688,191	650,652	618,276
Risk Assessment [Member] | Industry-standard insurance programs [Member]
Segment Reporting Information [Line Items]
Revenues	524,606	495,065	471,130
Risk Assessment [Member] | Property-specific rating and underwriting information [Member]
Segment Reporting Information [Line Items]
Revenues	$ 163,585	$ 155,587	$ 147,146

Segment Reporting - Long-lived

Segment Reporting - Long-lived Assets and Revenue by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Long-lived assets	$ 5,011,358	$ 1,960,847
U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	2,200,417	1,893,660
U.K. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	2,799,392	37,219
Other countries [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 11,549	$ 29,968

Related Parties - Additional In

Related Parties - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)relatedparty	Dec. 31, 2014USD ($)relatedparty	Dec. 31, 2013USD ($)
Related Party Transactions [Abstract]
Percentage of ownership on outstanding common stock required to become related party (more than)	5.00%	5.00%
Number of related parties | relatedparty	0	0
Revenues from related parties | $	$ 0	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Minimum Rentals under Long Term Noncancelable Leases for All Leased Premises, Computer Equipment and Automobiles (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Operating Leases
2,016	$ 46,245
2,017	45,466
2,018	37,398
2,019	37,714
2,020	40,276
2021 and thereafter	239,465
Net minimum lease payments	446,564
Capital Leases
2,016	4,976
2,017	1,457
2,018	641
2,019	220
2,020	53
2021 and thereafter	31
Net minimum lease payments	7,378
Less amount representing interest	250
Present value of net minimum lease capital payments	$ 7,128

Commitments and Contingencie108

Commitments and Contingencies - Additional Information (Detail)	Aug. 01, 2014plaintiffdefendant	Dec. 31, 2015USD ($)plaintiffpatent	Dec. 31, 2014USD ($)claim	Dec. 31, 2013USD ($)	Mar. 11, 2014
Loss Contingencies [Line Items]
Rent expense on operating leases | $		$ 45,423,000	$ 35,149,000	$ 32,186,000
Number of putative classes | claim			2
Patents allegedly infringed (in patents) | patent		7
Loss contingency, period of claim (in years)		3 years
Insurance Services Office [Member]
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	19
Number of defendants (more than) | defendant	120
Number of policyholders | plaintiff		4
Number of insurance companies (more than) | plaintiff		100
Interthinx [Member]
Loss Contingencies [Line Items]
Percentage of voting interests divested					100.00%
Minimum [Member]
Loss Contingencies [Line Items]
Damages sought | $		$ 100
Maximum [Member]
Loss Contingencies [Line Items]
Damages sought | $		$ 1,000

Schedule II - Valuation and 109

Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 5,995	$ 4,415	$ 4,753
Charged to Expenses / Against Revenue	[1]	1,305	1,814	2,468
Deductions - Write-offs	[2]	(2,230)	(161)	(2,284)
Adjustment	[3]	0	(73)	(522)
Balance at End of Year		5,070	5,995	4,415
Valuation allowance for income taxes [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		789	741	595
Charged to Expenses / Against Revenue	[1]	175	48	673
Deductions - Write-offs	[2]	(92)	0	(527)
Adjustment	[3]	0	0	0
Balance at End of Year		$ 872	$ 789	$ 741
[1]	Primarily additional reserves for bad debts
[2]	Primarily accounts receivable balances written off, net of recoveries, and the expiration of loss carryforwards
[3]	Related to discontinued operations