Brown & Brown (BRO) 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	BRO
Entity Registrant Name	BROWN & BROWN INC
Entity Central Index Key	79,282
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		139,403,675

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
REVENUES
Commissions and fees	$ 474,609	$ 461,652	$ 1,383,899	$ 1,329,649
Investment income	491	230	1,085	1,150
Other income, net	546	392	22,047	2,166
Total revenues	475,646	462,274	1,407,031	1,332,965
EXPENSES
Employee compensation and benefits	246,062	237,653	736,445	692,814
Other operating expenses	72,058	67,433	210,289	197,329
Loss/(gain) on disposal	(1,902)	(277)	(1,993)	(3,131)
Amortization	21,435	21,805	64,402	65,025
Depreciation	5,489	5,195	17,242	15,867
Interest	9,393	9,883	28,949	29,617
Change in estimated acquisition earn-out payables	(1,308)	3,610	8,309	6,846
Total expenses	351,227	345,302	1,063,643	1,004,367
Income before income taxes	124,419	116,972	343,388	328,598
Income taxes	48,506	45,427	131,263	128,733
Net income	$ 75,913	$ 71,545	$ 212,125	$ 199,865
Net income per share:
Basic (in dollars per share)	$ 0.54	$ 0.51	$ 1.52	$ 1.43
Diluted (in dollars per share)	0.53	0.50	1.49	1.41
Dividends declared per share (in dollars per share)	$ 0.1350	$ 0.1225	$ 0.405	$ 0.3675

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 546,520	$ 515,646
Restricted cash and investments	276,687	265,637
Short-term investments	29,156	15,048
Premiums, commissions and fees receivable	525,943	502,482
Reinsurance recoverable	2,160,286	78,083
Prepaid reinsurance premiums	332,246	308,661
Other current assets	45,545	50,571
Total current assets	3,916,383	1,736,128
Fixed assets, net	71,296	75,807
Goodwill	2,701,488	2,675,402
Amortizable intangible assets, net	656,054	707,454
Investments	14,085	23,048
Other assets	54,971	44,895
Total assets	7,414,277	5,262,734
Current Liabilities:
Premiums payable to insurance companies	653,289	647,564
Losses and loss adjustment reserve	2,160,286	78,083
Unearned premiums	332,246	308,661
Premium deposits and credits due customers	97,917	83,765
Accounts payable	63,623	69,595
Accrued expenses and other liabilities	204,153	201,989
Current portion of long-term debt	120,000	55,500
Total current liabilities	3,631,514	1,445,157
Long-term debt less unamortized discount and debt issuance costs	860,741	1,018,372
Deferred income taxes, net	382,228	357,686
Other liabilities	56,147	81,308
Shareholders’ Equity:
Common stock, par value $0.10 per share; authorized 280,000 shares; issued 148,838 shares and outstanding 139,518 shares at 2017, issued 148,107 shares and outstanding 140,104 shares at 2016	14,884	14,811
Additional paid-in capital	493,821	468,443
Treasury stock, at cost at 9,319 shares at 2017 and 8,003 shares at 2016, respectively	(315,072)	(257,683)
Retained earnings	2,290,014	2,134,640
Total shareholders’ equity	2,483,647	2,360,211
Total liabilities and shareholders’ equity	$ 7,414,277	$ 5,262,734

CONDENSED CONSOLIDATED BALANCE4

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	280,000,000	280,000,000
Common stock, shares issued (in shares)	148,837,537	148,107,038
Common stock, shares outstanding (in shares)	139,517,992	140,103,841
Treasury stock shares (in shares)	9,319,545	8,003,197

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
Document Period End Date			Sep. 30, 2017
Cash, Cash Equivalents and Restricted Cash			$ 823,207	$ 766,962	$ 781,283	$ 673,173
Cash flows from operating activities:
Net income	$ 75,913	$ 71,545	212,125	199,865
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	21,435	21,805	64,402	65,025
Depreciation	5,489	5,195	17,242	15,867
Non-cash stock-based compensation			22,362	11,593
Change in estimated acquisition earn-out payables	(1,308)	3,610	8,309	6,846
Deferred income taxes			23,941	20,081
Amortization of debt discount			119	118
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Amortization Expense			1,309	1,207
Accretion (Amortization) of Discounts and Premiums, Investments			20	36
Income tax benefit from exercise of shares from the stock benefit plans			0	(7,213)
Payments On Acquisition Earn Outs In Excess Of Original Estimated Payables			(13,800)	(3,683)
Net loss/(gain) on sales of investments, fixed assets and customer accounts			(1,739)	(2,860)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Premiums, commissions and fees receivable decrease (increase)			(23,350)	(31,324)
Reinsurance recoverables decrease (increase)			(2,082,203)	(300,036)
Prepaid reinsurance premiums decrease			(23,585)	(24,324)
Other assets (increase)			(5,314)	1,231
Premiums payable to insurance companies decrease			5,585	39,787
Premium deposits and credits due customers increase			14,030	27,914
Losses and loss adjustment reserve (decrease) increase			2,082,203	300,036
Unearned premiums (decrease)			23,585	24,324
Accounts payable increase			22,113	13,858
Accrued expenses and other liabilities (decrease)			1,018	(22,119)
Other liabilities (decrease)			(34,802)	(17,094)
Net cash provided by operating activities			313,570	319,135
Cash flows from investing activities:
Additions to fixed assets	(4,049)	(4,191)	(12,897)	(13,135)
Payments for businesses acquired, net of cash acquired			(26,478)	(113,219)
Proceeds from sales of fixed assets and customer accounts			4,085	3,411
Purchases of investments			(10,393)	(24,332)
Proceeds from Sale, Maturity and Collection of Investments			5,178	16,716
Net cash used in investing activities			(40,505)	(130,559)
Cash flows from financing activities:
Payments on acquisition earn-outs			(25,488)	(23,872)
Payments on long-term debt			(91,750)	(34,375)
Income tax benefit from exercise of shares from the stock benefit plans			0	7,213
Issuances of common stock for employee stock benefit plans			17,387	15,959
Repurchase Of Stock Benefit Plan Shares For Employees To Fund Tax Withholdings			(6,791)	(8,395)
Purchase of treasury stock			(57,389)	(11,250)
Settlement of accelerated share repurchase program			(7,500)	11,250
Cash dividends paid			(56,801)	(51,317)
Net cash used in financing activities			(231,141)	(94,787)
Payments of Debt Issuance Costs			(2,809)
Net increase in cash and cash equivalents inclusive of restricted cash			41,924	93,789
Cash and cash equivalents inclusive of restricted cash at end of period	$ 546,520	$ 488,683	$ 546,520	$ 488,683	$ 515,646	$ 443,420

Nature of Operations

Nature of Operations	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Brown & Brown, Inc., a Florida corporation, and its subsidiaries (collectively, “Brown & Brown” or the “Company”) is a diversified insurance agency, wholesale brokerage, insurance programs and services organization that markets and sells to its customers, insurance products and services, primarily in the property, casualty and employee benefits areas. Brown & Brown’s business is divided into four reportable segments: the Retail Segment provides a broad range of insurance products and services to commercial, public and quasi-public entities, professional and individual customers; the National Programs Segment, acting as a managing general agent (“MGA”), provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through nationwide networks of independent agents, including Brown & Brown retail agents; the Wholesale Brokerage Segment markets and sells excess and surplus commercial insurance, primarily through independent agents and brokers, as well as Brown & Brown Retail offices; and the Services Segment provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services, and claims adjusting services.

Basis of Financial Reporting

Basis of Financial Reporting	9 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Basis of Financial Reporting	Basis of Financial Reporting The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes thereto set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . The preparation of these financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates. Recently Issued Accounting Pronouncements In November 2016, the Financial Accountings Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-18, “Statement of Cash Flows (Topic 230)”: Restricted Cash (“ASU 2016-18”), which requires that the Statement of Cash Flows explain the changes during the period of cash and cash equivalents inclusive of amounts categorized as restricted cash. ASU 2016-18 is effective for periods beginning after December 15, 2017. However, the Company elected to early adopt for the reporting period ended March 31, 2017 under the full retrospective approach for all periods presented. With the adoption of ASU 2016-18, the change in restricted cash is no longer reflected as a change in operating assets and liabilities, and the Statement of Cash Flows details the changes in the balance of cash and cash equivalents inclusive of restricted cash. Net cash provided by operating activities for the nine months ended September 30, 2016 were previously reported as $270.6 million . With the retrospective adoption, the net cash provided by operating activities for the nine months ended September 30, 2016 is now reported as $319.1 million . The Company reflects cash collected from customers that is payable to insurance companies as restricted cash if segregation of this cash is required by the state of domicile for the office conducting this transaction or if required by contract with the relevant insurance company providing coverage. Cash collected from customers that is payable to insurance companies is reported in cash and cash equivalents if no such restriction is required. In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230)”: Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) (“ASU 2016-15”), which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified and applies to all entities, including both business entities and not-for-profit entities that are required to present a statement of cash flows under Topic 230. ASU 2016-15 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 and early adoption is permitted. The Company has evaluated the impact of ASU 2016-15 and has determined there is no impact on the Company's Statement of Cash Flows. The Company already presents cash paid on contingent consideration in business combination as prescribed by ASU 2016-15 and does not, at this time, engage in the other activities being addressed. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share Based Payment Accounting” (“ASU 2016-09”), which amends guidance issued in Accounting Standards Codification (“ASC”) Topic 718, Compensation - Stock Compensation. ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years and early adoption is permitted. The Company adopted the guidance on January 1, 2017, as required. Prior periods have not been adjusted, as the guidance was adopted prospectively. The principal impact is that the tax benefit or expense from stock compensation is now presented in the income tax line of the Statement of Income, whereas the prior treatment was to present this amount as a component of equity on the Balance Sheet. Also the tax benefit or expense is now presented as activity in Cash Flow from Operating Activity, rather than the prior presentation as Cash Flow from Financing Activity in the Statement of Cash Flows. The Company also continues to estimate forfeitures of stock grants as allowed by ASU 2016-09. In March 2016, the FASB issued ASU 2016-08, “Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net)” (“ASU 2016-08”) to clarify certain aspects of the principal-versus-agent guidance included in the new revenue standard ASU 2014-09 “Revenue from Contracts with Customers” (“ASU 2014-09”). The FASB issued the ASU in response to concerns identified by stakeholders, including those related to (1) determining the appropriate unit of account under the revenue standard’s principal-versus-agent guidance and (2) applying the indicators of whether an entity is a principal or an agent in accordance with the revenue standard’s control principle. ASU 2016-08 is effective contemporaneous with ASU 2014-09 beginning January 1, 2018. The impact of ASU 2016-08 is currently being evaluated along with ASU 2014-09. At this point in our evaluation the potential impact would primarily be limited to the claims administering activities within our Services Segment and therefore not material to the Company. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), which provides guidance for accounting for leases. Under ASU 2016-02, the Company will be required to recognize the assets and liabilities for the rights and obligations created by leased assets. ASU 2016-02 will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company continues to evaluate the impact of this pronouncement with the principal impact being that the present value of the remaining lease payments be presented as a liability on the Balance Sheet as well as an asset of similar value representing the “Right of Use” for those leased properties. As detailed in Note 13 of the 2016 10-K, the undiscounted contractual cash payments remaining on leased properties was $213.2 million as of December 31, 2016 and is $200.3 million as of September 30, 2017 as detailed in the Liquidity and Capital Resources section of this Quarterly Report on Form 10-Q. In November 2015, FASB issued ASU No. 2015-17, “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes” (“ASU 2015-17”), which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as a single non-current item on the balance sheet. ASU 2015-17 is effective for fiscal years beginning after December 15, 2016 with early adoption permitted as of the beginning of any interim or annual reporting period. The Company adopted the guidance on January 1, 2017, as required. As a result, the Company retrospectively applied the guidance to the 2016 balance sheet by reclassifying $24.6 million from deferred income taxes (asset) to deferred income taxes, net (liability) on the Condensed Consolidated Balance Sheet. In May 2014, FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“Topic 606”), which provides guidance for revenue recognition. Topic 606 affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets. It supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” and most industry-specific guidance. The standard’s core principle is that a company should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which a company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the current guidance. Specifically, in situations where multiple performance obligations exist within a contract, the use of estimates is required to allocate the transaction price to each separate performance obligation. Historically, approximately 70% of the Company’s commissions and fees revenue is in the form of commissions paid by insurance carriers. These commissions are earned upon the effective date of bound coverage as no significant performance obligation remains after coverage is bound. Approximately 20% of the Company's commissions and fees revenue is in the form of fees, which are predominantly in our National Programs and Services Segments, and to a lesser extent in the large accounts business within our Retail Segment. At the conclusion of our evaluation, it may be determined that fee revenue from certain agreements will be recognized in earlier or later periods under the new guidance as compared to our current accounting. Based upon the work completed to date, the Company does not expect the overall impact of these potential changes to be significant on a full-year basis, but they may impact the timing of recognizing revenue among quarters. The Company is continuing to evaluate approximately 10% of the Company's commissions and fees revenues and anticipates completion of this evaluation by December 31, 2017. Additionally, the Company is continuing to evaluate the requirement under ASC Topic 340 - Other Assets and Deferred Cost ("ASC 340") to capitalize costs to obtain, and costs to fulfill, customer contracts, and recognize these costs over the associated life of the contract as the performance obligations are fulfilled. This evaluation includes assessing the costs that would qualify for capitalization as well as the timing to recognize these costs in future periods in accordance with ASC 340. Presently all costs to obtain, and costs to fulfill, customer contracts are expensed by the Company as incurred. The primary areas the Company has identified thus far that will be impacted by the adoption of the new revenue recognition standards are summarized below. Contingent commissions - Under current accounting standards, revenue that is not fixed and determinable because a contingency exists is not recognized until the contingency is resolved. Under Topic 606 the Company must use judgment to estimate the amount of consideration that will be received such that a significant reversal of revenue is not probable. Contingent commissions represent a form of variable consideration associated with the same performance obligation, which is in the form of placement of coverage, for which we earn core commissions. In connection with the new standard, contingent commissions will be estimated with an appropriate constraint applied and accrued relative to the core commissions as they are recognized. The resulting effect on the timing of recognition of contingent commissions will more closely follow a similar pattern as our core commissions with true-ups recognized when payments are received or as additional information that affects the estimate becomes available. As disclosed in Item 7 of the Company's Annual Report on Form 10-K for the year ended December 31, 2016, contingent commissions have averaged approximately 3.6% of the previous year’s total commissions and fees revenue over the last three years and have primarily been received in the first and second quarters of the year. Cost deferrals - ASC 340 requires an entity to defer the incremental costs to obtain a customer contract and recognize these costs over the anticipated life of the customer relationship, inclusive of anticipated renewals. This requirement will primarily affect the Company as it relates to certain commission-based compensation plans in the Retail Segment whereby the Company pays an incremental amount of compensation on new business in the first year. As has been disclosed in Note 4 to the Financial Statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, the weighted average life of purchased customer accounts is 15 years. ASC 340 also requires a company to defer costs to fulfill a contract and recognize these costs as the associated performance obligations are fulfilled. In order for contract fulfillment costs to be deferred under ASC 340, the costs must (1) relate directly to a specific contract or anticipated contract, (2) generate or enhance resources that the Company will use in satisfying its obligations under the contract, and (3) be expected to be recovered through sufficient net cashflows from the contract. We are evaluating and believe the impact of ASC 340 related to contract fulfillment costs will primarily affect businesses that recognize revenue based upon on fees. Based upon the work completed to date, the Company does not expect the overall impact of the potential change to be significant on a full-year basis, but may impact the timing of recognizing expense among quarters. Installment billing - As disclosed in Note 1 to the Financial Statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, commission revenues related to installment billings are recognized on the latter of the policy effective date (as indicated in the policy) or the date that the premium was billed to the client (as indicated in the premium invoice), with the exception of our Arrowhead businesses, which follows a policy of recognizing these revenues on the latter of the policy effective date or processed date into our systems, regardless of the billing arrangement. We are still determining the impact of recognizing installment revenue upon delivery of the contract fulfillment obligation. Topic 606 is effective for the Company beginning January 1, 2018. Entities are permitted to adopt the guidance under one of the following methods: the "full retrospective" method, which applies the guidance to each period presented (prior years restated), or the "modified retrospective" method, in which the guidance is only applied to the year of adoption, with the cumulative effect of initially applying the guidance recognized as an adjustment to retained earnings. The Company is evaluating the adoption method it will use, but currently expects to use the modified retrospective method. In connection with the implementation of the above standards, we will augment our current procedures and controls, as necessary to support the new standards.

Net Income Per Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share Basic EPS is computed based on the weighted average number of common shares (including restricted shares) issued and outstanding during the period. Diluted EPS is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. The following is a reconciliation between basic and diluted weighted average shares outstanding: For the three months For the nine months (in thousands, except per share data) 2017 2016 2017 2016 Net income $ 75,913 $ 71,545 $ 212,125 $ 199,865 Net income attributable to unvested awarded performance stock (1,852 ) (1,873 ) (5,181 ) (5,210 ) Net income attributable to common shares $ 74,061 $ 69,672 $ 206,944 $ 194,655 Weighted average number of common shares outstanding – basic 139,756 140,129 140,012 139,642 Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic (3,410 ) (3,668 ) (3,420 ) (3,640 ) Weighted average number of common shares outstanding for basic earnings per common share 136,346 136,461 136,592 136,002 Dilutive effect of stock options 2,547 1,721 2,419 1,582 Weighted average number of shares outstanding – diluted 138,893 138,182 139,011 137,584 Net income per share: Basic $ 0.54 $ 0.51 $ 1.52 $ 1.43 Diluted $ 0.53 $ 0.50 $ 1.49 $ 1.41

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations During the nine months ended September 30, 2017 , Brown & Brown acquired the assets and assumed certain liabilities of six insurance intermediaries. Additionally, miscellaneous adjustments were recorded to the purchase price allocation of certain prior acquisitions completed within the last twelve months as permitted by Accounting Standards Codification Topic 805 — Business Combinations (“ASC 805”). Such adjustments are presented in the “Other” category within the following two tables. The recorded purchase price for all acquisitions included an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the Condensed Consolidated Statement of Income when incurred. The fair value of earn-out obligations is based on the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, the acquired business’s future performance is estimated using financial projections developed by management for the acquired business and reflects market participant assumptions regarding revenue growth and/or profitability. The expected future payments are estimated on the basis of the earn-out formula and performance targets specified in each purchase agreement compared to the associated financial projections. These payments are then discounted to present value using a risk-adjusted rate that takes into consideration the likelihood that the forecasted earn-out payments will be made. Based on the acquisition date and the complexity of the underlying valuation work, certain amounts included in the Company’s Condensed Consolidated Financial Statements may be provisional and thus subject to further adjustments within the permitted measurement period, as defined in ASC 805. For the nine months ended September 30, 2017 , several adjustments were made within the permitted measurement period that resulted in an increase in the aggregate purchase price of the affected acquisitions of $1.5 million relating to the assumption of certain liabilities. These measurement period adjustments have been reflected as current period adjustments in the nine months ended September 30, 2017 in accordance with the guidance in ASU 2015-16 “Business Combinations”. The measurement period adjustments primarily impacted goodwill, with no effect on earnings or cash in the current period. Cash paid for acquisitions was $ 26.5 million and $ 115.3 million in the nine -month periods ended September 30, 2017 and 2016 , respectively. We completed six acquisitions (excluding book of business purchases) in the nine -month period ended September 30, 2017 . We completed six acquisitions (excluding book of business purchases) in the nine -month period ended September 30, 2016 . The following table summarizes the purchase price allocations made as of the date of each acquisition for current year acquisitions and adjustments made during the measurement period for prior year acquisitions. During the measurement periods, the Company will adjust assets or liabilities if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets and liabilities as of that date. These adjustments are made in the period in which the amounts are determined and the current period income effect of such adjustments will be calculated as if the adjustments had been completed as of the acquisition date. (in thousands) Name Business Segment Effective Date of Acquisition Cash Paid Other Payable Recorded Earn-Out Payable Net Assets Acquired Maximum Potential Earn- Out Payable Other Various Various 26,478 11,395 1,332 39,205 11,605 Total $ 26,478 $ 11,395 $ 1,332 $ 39,205 $ 11,605 The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition and adjustments made during the measurement period of the prior year acquisitions. (in thousands) Other Total Other current assets 98 98 Fixed assets 47 47 Goodwill 27,580 27,580 Purchased customer accounts 12,858 12,858 Non-compete agreements 595 595 Total assets acquired 41,178 41,178 Other current liabilities (1,284 ) (1,284 ) Deferred income tax, net (689 ) (689 ) Total liabilities assumed (1,973 ) (1,973 ) Net assets acquired $ 39,205 $ 39,205 The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15 years ; and non-compete agreements, 5 years . Goodwill of $27.6 million , which is net of any opening balance sheet adjustments within the allowable measurement period, was allocated to the Retail, National Programs, Wholesale Brokerage and Service Segments in the amounts of $18.8 million , $7.3 million , $0.8 million and $0.7 million , respectively. Of the total goodwill of $27.6 million , the amount currently deductible for income tax purposes is $26.3 million and the remaining $1.3 million relates to the recorded earn-out payables and will not be deductible until it is earned and paid. For the acquisitions completed during 2017, the results of operations since the acquisition dates have been combined with those of the Company. The total revenues from the acquisitions completed through September 30, 2017 , included in the Condensed Consolidated Statement of Income for the three and nine months ended September 30, 2017 , were $3.2 million and $3.6 million , respectively. The income before income taxes, including the intercompany cost of capital charge, from the acquisitions completed through September 30, 2017 , included in the Condensed Consolidated Statement of Income for the three and nine months ended September 30, 2017 , were $0.9 million and $1.0 million , respectively. If the acquisitions had occurred as of the beginning of the respective periods, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods. (UNAUDITED) For the three months For the nine months (in thousands, except per share data) 2017 2016 2017 2016 Total revenues $ 476,124 $ 465,014 $ 1,413,278 $ 1,341,511 Income before income taxes $ 124,582 $ 117,929 $ 345,608 $ 331,574 Net income $ 76,012 $ 72,130 $ 213,496 $ 201,675 Net income per share: Basic $ 0.54 $ 0.51 $ 1.52 $ 1.44 Diluted $ 0.53 $ 0.51 $ 1.50 $ 1.43 Weighted average number of shares outstanding: Basic 136,346 136,461 136,592 136,002 Diluted 138,893 138,182 139,011 137,584 As of September 30, 2017 and 2016 , the fair values of the estimated acquisition earn-out payables were re-evaluated and measured at fair value on a recurring basis using unobservable inputs (Level 3) as defined in ASC 820- Fair Value Measurement . The resulting additions, payments, and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the three and nine months ended September 30, 2017 and 2016 , were as follows: For the three months For the nine months (in thousands) 2017 2016 2017 2016 Balance as of the beginning of the period $ 57,943 $ 73,447 $ 63,821 $ 78,387 Additions to estimated acquisition earn-out payables 1,050 1,437 1,332 3,828 Payments for estimated acquisition earn-out payables (23,511 ) (16,988 ) (39,288 ) (27,555 ) Subtotal 35,482 57,896 25,865 54,660 Net change in earnings from estimated acquisition earn-out payables: Change in fair value on estimated acquisition earn-out payables (1,784 ) 2,883 6,402 4,704 Interest expense accretion 476 727 1,907 2,142 Net change in earnings from estimated acquisition earn-out payables (1,308 ) 3,610 8,309 6,846 Balance as of September 30, $ 34,174 $ 61,506 $ 34,174 $ 61,506 Of the $34.2 million estimated acquisition earn-out payables as of September 30, 2017 , $28.7 million was recorded as accounts payable and $5.5 million was recorded as other non-current liabilities. As of September 30, 2017 , the maximum future acquisition contingency payments related to all acquisitions was $81.5 million , inclusive of the $34.2 million estimated acquisition earn-out payables as of September 30, 2017 . Included within the additions to estimated acquisition earn-out payables are any adjustments to opening balance sheet items within the allowable measurement period, which may therefore differ from previously reported amounts.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill is subject to at least an annual assessment for impairment by applying a fair value-based test. The Company completed its most recent annual assessment as of November 30, 2016, and identified no impairment as a result of the evaluation. The changes in the carrying value of goodwill by reportable segment for the nine months ended September 30, 2017 are as follows: (in thousands) Retail National Programs Wholesale Brokerage Services Total Balance as of January 1, 2017 $ 1,354,667 $ 901,294 $ 284,869 $ 134,572 $ 2,675,402 Goodwill of acquired businesses 18,807 7,314 770 689 27,580 Goodwill disposed of relating to sales of businesses (1,494 ) — — — (1,494 ) Balance as of September 30, 2017 $ 1,371,980 $ 908,608 $ 285,639 $ 135,261 $ 2,701,488

Amortizable Intangible Assets

Amortizable Intangible Assets	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortizable Intangible Assets	Amortizable Intangible Assets Amortizable intangible assets at September 30, 2017 and December 31, 2016 consisted of the following: September 30, 2017 December 31, 2016 (in thousands) Gross Carrying Value Accumulated Amortization Net Carrying Value Weighted Average Life (Years) (1) Gross Carrying Value Accumulated Amortization Net Carrying Value Weighted Average Life (Years) (1) Purchased customer accounts $ 1,458,405 $ (803,764 ) $ 654,641 15.0 $ 1,447,680 $ (741,770 ) $ 705,910 15.0 Non-compete agreements 30,161 (28,748 ) 1,413 6.8 29,668 (28,124 ) 1,544 6.8 Total $ 1,488,566 $ (832,512 ) $ 656,054 $ 1,477,348 $ (769,894 ) $ 707,454 (1) Weighted average life calculated as of the date of acquisition. Amortization expense for amortizable intangible assets for the years ending December 31, 2017 , 2018 , 2019 , 2020 and 2021 is estimated to be $85.3 million , $80.6 million , $76.1 million , $68.7 million , and $65.4 million , respectively.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt at September 30, 2017 and December 31, 2016 consisted of the following: (in thousands) September 30, December 31, 2016 Current portion of long-term debt: Current portion of 5-year term loan facility expires June 28, 2022 $ 20,000 $ 55,000 4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 100,000 — Short-term promissory note — 500 Total current portion of long-term debt 120,000 55,500 Long-term debt: Note agreements: 4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 — 100,000 4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024 498,904 498,785 Total notes 498,904 598,785 Credit agreements: 5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022 370,000 426,250 5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022 — — Total credit agreements 370,000 426,250 Debt issuance costs (contra) (8,163 ) (6,663 ) Total long-term debt less unamortized discount and debt issuance costs 860,741 1,018,372 Current portion of long-term debt 120,000 55,500 Total debt $ 980,741 $ 1,073,872 On December 22, 2006, the Company entered into a Master Shelf and Note Purchase Agreement (the “Master Agreement”) with a national insurance company (the “Purchaser”). The initial issuance of notes under the Master Agreement occurred on December 22, 2006, through the issuance of $25.0 million in Series C Senior Notes due December 22, 2016, with a fixed interest rate of 5.660% per year. On February 1, 2008, $25.0 million in Series D Senior Notes due January 15, 2015, with a fixed interest rate of 5.370% per year, were issued. On September 15, 2011, and pursuant to a Confirmation of Acceptance (the “Confirmation”), dated January 21, 2011, in connection with the Master Agreement, $100.0 million in Series E Senior Notes were issued and are due September 15, 2018, with a fixed interest rate of 4.500% per year. The Series E Senior Notes were issued for the sole purpose of retiring existing senior notes. On January 15, 2015 the Series D Senior Notes were redeemed at maturity using cash proceeds to pay off the principal of $25.0 million plus any remaining accrued interest. On December 22, 2016, the Series C Senior Notes were redeemed at maturity using cash proceeds to pay off the principal of $25.0 million plus any remaining accrued interest. As of September 30, 2017 , there was an outstanding debt balance issued under the provisions of the Master Agreement of $100.0 million . On April 17, 2014, the Company entered into a credit agreement with JPMorgan Chase Bank, N.A. as administrative agent and certain other banks as co-syndication agents and co-documentation agents (the “Credit Agreement”). The Credit Agreement in the amount of $1,350.0 million provides for an unsecured revolving credit facility (the “Credit Facility”) in the initial amount of $800.0 million and unsecured term loans in the initial amount of $550.0 million , either or both of which may, subject to lenders’ discretion, potentially be increased by up to $500.0 million . The Credit Facility was funded on May 20, 2014 in conjunction with the closing of The Wright Insurance Group, LLC (“Wright”) acquisition, with the $550.0 million term loan being funded as well as a drawdown of $375.0 million on the revolving loan facility. Use of these proceeds was to retire existing term loan debt and to facilitate the closing of the Wright acquisition as well as other acquisitions. The Credit Facility terminates on May 20, 2019, but either or both of the revolving Credit Facility and the term loans may be extended for two additional one -year periods at the Company’s request and at the discretion of the respective lenders. Interest and facility fees in respect to the Credit Facility are based on the better of the Company’s net debt leverage ratio or a non-credit enhanced senior unsecured long-term debt rating. Based on the Company’s net debt leverage ratio, the rates of interest charged on the term loan are 1.000% to 1.750% , and the revolving loan is 0.850% to 1.500% above the adjusted LIBOR rate for outstanding amounts drawn. There are fees included in the facility which include a facility fee based on the revolving credit commitments of the lenders (whether used or unused) at a rate of 0.150% to 0.250% and letter of credit fees based on the amounts of outstanding secured or unsecured letters of credit. The Credit Facility includes various covenants, limitations and events of default customary for similar facilities for similarly rated borrowers. On June 28, 2017, the Company entered into an amended and restated credit agreement (the “Amended and Restated Credit Agreement”) with the lenders named therein, JPMorgan Chase Bank, N.A. as administrative agent and certain other banks as co-syndication agents and co-documentation agents. The Amended and Restated Credit Agreement amended and restated the credit agreement dated April 17, 2014, among such parties (the “Original Credit Agreement”). The Amended and Restated Credit Agreement extends the applicable maturity date of the existing revolving credit facility (the “Facility”) of $800.0 million to June 28, 2022 and re-evidences unsecured term loans at $400.0 million while also extending the applicable maturity date to June 28, 2022. The term loan principal amortization schedule was reset with payments due quarterly. At the time of the execution of the Amended and Restated Credit Agreement, $67.5 million of principal from the original unsecured term loans was repaid using operating cash balances, and the Company added an additional $2.8 million in debt issuance costs related to the facility to the Consolidated Balance Sheet. The Company also expensed to the Consolidated Statements of Income $0.2 million of debt issuance costs related to the Original Credit Agreement due to certain lenders exiting prior to the modified agreement, while also carrying forward $1.6 million on the Consolidated Balance Sheet the unamortized portion of the Original Credit Agreement debt issuance costs which will amortize over the term of the Amended and Restated Credit Agreement. On September 30, 2017, a scheduled principal payment of $5.0 million was satisfied per the terms of the Amended and Restated Credit Agreement. As of September 30, 2017, there was an outstanding debt balance issued under the terms of the Amended and Restated Credit Agreement of $390.0 million with no borrowings outstanding against the revolving loan. Per the terms of the Amended and Restated Credit Agreement, a scheduled principal payment of $5.0 million is due December 31, 2017. On September 18, 2014, the Company issued $500.0 million of 4.200% unsecured senior notes due in 2024 . The senior notes were given investment grade ratings of BBB-/Baa3 with a stable outlook. The notes are subject to certain covenant restrictions and regulations which are customary for credit rated obligations. At the time of funding, the proceeds were offered at a discount of the original note amount which also excluded an underwriting fee discount. The net proceeds received from the issuance were used to repay the outstanding balance of $475.0 million on the revolving Credit Facility and for other general corporate purposes. As of September 30, 2017 and December 31, 2016, there was an outstanding debt balance of $500.0 million exclusive of the associated discount balance. In conjunction with the acquisition of Social Security Advocates for the Disabled (SSAD) effective February 1, 2016, the company added a $0.5 million promissory note incurred as a payment to the sellers and payable after the one-year anniversary of the acquisition. The note had a nominal rate of interest 0.810% . On March 10, 2017, the promissory note was settled, plus any outstanding accrued interest, using cash. The Master Agreement and the Amended and Restated Credit Agreement require the Company to maintain certain financial ratios and comply with certain other covenants. The Company was in compliance with all such covenants as of September 30, 2017 and December 31, 2016. The 30-day Adjusted LIBOR Rate as of September 30, 2017 was 1.250% .

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities	9 Months Ended
	Sep. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities	Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities For the nine months (in thousands) 2017 2016 Cash paid during the period for: Interest $ 32,504 $ 33,122 Income taxes $ 110,853 $ 104,739 Brown & Brown’s significant non-cash investing and financing activities are summarized as follows: For the nine months (in thousands) 2017 2016 Other payable issued for purchased customer accounts $ 11,395 $ 10,505 Estimated acquisition earn-out payables and related charges $ 1,332 $ 3,828 Notes payable issued or assumed for purchased customer accounts $ — $ 492 The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of September 30, 2017 and 2016 . Balance as of September 30, (in thousands) 2017 2016 Table to reconcile cash and cash equivalents inclusive of restricted cash Cash and cash equivalents $ 546,520 $ 488,683 Restricted cash 276,687 278,279 Total cash and cash equivalents inclusive of restricted cash at the end of the period $ 823,207 $ 766,962 The following is a reconciliation of cash and cash equivalents inclusive of restricted cash as of December 31, 2016 and 2015 . Balance as of December 31, (in thousands) 2016 2015 Table to reconcile cash and cash equivalents inclusive of restricted cash Cash and cash equivalents $ 515,646 $ 443,420 Restricted cash 265,637 229,753 Total cash and cash equivalents inclusive of restricted cash at the end of the period $ 781,283 $ 673,173

Legal and Regulatory Proceeding

Legal and Regulatory Proceedings	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal and Regulatory Proceedings	Legal and Regulatory Proceedings The Company is involved in numerous pending or threatened proceedings by or against Brown & Brown, Inc. or one or more of its subsidiaries that arise in the ordinary course of business. The damages that may be claimed against the Company in these various proceedings are in some cases substantial, including in certain instances claims for punitive or extraordinary damages. Some of these claims and lawsuits have been resolved, others are in the process of being resolved and others are still in the investigation or discovery phase. The Company will continue to respond appropriately to these claims and lawsuits and to vigorously protect its interests. During the first quarter of 2017, the Company was successful in settling a lawsuit it had brought against certain former employees of Brown & Brown, their employer, AssuredPartners, Inc. and certain key executives of AssuredPartners. The settlement included a payment of $20,000,000 by AssuredPartners to Brown & Brown in exchange for releasing certain individuals from restrictive covenants in the employment contracts they had signed with the Company and provides protection for current Brown & Brown teammates from continued solicitation for employment by AssuredPartners. The proceeds of the settlement were received in March 2017 and were recorded in the Other income line in the Statement of Income. We continue to assess certain litigation and claims to determine the amounts, if any, that management believes will be paid as a result of such claims and litigation and, therefore, additional losses may be accrued and paid in the future, which could adversely impact the Company’s operating results, cash flows and overall liquidity. The Company maintains third-party insurance policies to provide coverage for certain legal claims, in an effort to mitigate its overall exposure to unanticipated claims or adverse decisions. However, as (i) one or more of the Company’s insurance carriers could take the position that portions of these claims are not covered by the Company’s insurance, (ii) to the extent that payments are made to resolve claims and lawsuits, applicable insurance policy limits are eroded and (iii) the claims and lawsuits relating to these matters are continuing to develop, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by unfavorable resolutions of these matters. Based on the AM Best Company ratings of these third-party insurers, management does not believe there is a substantial risk of an insurer’s material non-performance related to any current insured claims. On the basis of current information, the availability of insurance and legal advice, in management’s opinion, the Company is not currently involved in any legal proceedings which, individually or in the aggregate, would have a material adverse effect on its financial condition, operations and/or cash flows.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information Brown & Brown’s business is divided into four reportable segments:(1) the Retail Segment, which provides a broad range of insurance products and services to commercial, public and quasi-public entities, and to professional and individual customers; (2) the National Programs Segment, which acts as a MGA, provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through nationwide networks of independent agents, and Brown & Brown retail agents; (3) the Wholesale Brokerage Segment, which markets and sells excess and surplus commercial and personal lines insurance, primarily through independent agents and brokers, as well as Brown & Brown retail agents; and (4) the Services Segment, which provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services and claims adjusting services. Brown & Brown conducts all of its operations within the United States of America, except for a wholesale brokerage operation based in London, England, and retail operations in Bermuda and the Cayman Islands. These operations earned $3.9 million and $3.8 million of total revenues for the three months ended September 30, 2017 and 2016 , respectively. These operations earned $11.1 million and $10.3 million of total revenues for the nine months ended September 30, 2017 and 2016 , respectively. Long-lived assets held outside of the United States as of September 30, 2017 and 2016 were not material. The accounting policies of the reportable segments are the same as those described in Note 1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . The Company evaluates the performance of its segments based upon revenues and income before income taxes. Inter-segment revenues are eliminated. Summarized financial information concerning the Company’s reportable segments is shown in the following table. The “Other” column includes any income and expenses not allocated to reportable segments, corporate-related items, including the inter-company interest expense charge to the reporting segment, and the elimination of inter-segment activities. For the three months ended September 30, 2017 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 234,483 $ 127,718 $ 71,574 $ 41,491 $ 380 $ 475,646 Investment income $ 3 $ 124 $ — $ 72 $ 292 $ 491 Amortization $ 10,540 $ 6,913 $ 2,845 $ 1,137 $ — $ 21,435 Depreciation $ 1,262 $ 1,412 $ 471 $ 402 $ 1,942 $ 5,489 Interest expense $ 7,216 $ 8,304 $ 1,515 $ 876 $ (8,518 ) $ 9,393 Income before income taxes $ 54,950 $ 32,203 $ 21,219 $ 7,910 $ 8,137 $ 124,419 Total assets $ 4,246,422 $ 5,026,918 $ 1,258,783 $ 432,331 $ (3,550,177 ) $ 7,414,277 Capital expenditures $ 844 $ 1,357 $ 214 $ 364 $ 1,270 $ 4,049 For the three months ended September 30, 2016 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 228,645 $ 123,632 $ 70,192 $ 39,586 $ 219 $ 462,274 Investment income $ 5 $ 96 $ — $ 57 $ 72 $ 230 Amortization $ 10,861 $ 6,921 $ 2,882 $ 1,140 $ 1 $ 21,805 Depreciation $ 1,508 $ 1,945 $ 503 $ 473 $ 766 $ 5,195 Interest expense $ 9,026 $ 10,844 $ 1,540 $ 1,257 $ (12,784 ) $ 9,883 Income before income taxes $ 44,894 $ 32,319 $ 20,862 $ 5,971 $ 12,926 $ 116,972 Total assets $ 3,652,977 $ 2,933,568 $ 1,053,516 $ 342,360 $ (2,460,394 ) $ 5,522,027 Capital expenditures $ 1,443 $ 2,153 $ 11 $ 80 $ 504 $ 4,191 For the nine months ended September 30, 2017 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 712,739 $ 342,576 $ 208,812 $ 122,397 $ 20,507 $ 1,407,031 Investment income $ 6 $ 279 $ — $ 224 $ 576 $ 1,085 Amortization $ 31,704 $ 20,664 $ 8,621 $ 3,412 $ 1 $ 64,402 Depreciation $ 3,975 $ 4,975 $ 1,438 $ 1,191 $ 5,663 $ 17,242 Interest expense $ 23,918 $ 27,257 $ 4,803 $ 2,783 $ (29,812 ) $ 28,949 Income before income taxes $ 151,783 $ 68,127 $ 56,569 $ 22,480 $ 44,429 $ 343,388 Total assets $ 4,246,422 $ 5,026,918 $ 1,258,783 $ 432,331 $ (3,550,177 ) $ 7,414,277 Capital expenditures $ 3,384 $ 3,885 $ 1,606 $ 856 $ 3,166 $ 12,897 For the nine months ended September 30, 2016 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 695,393 $ 333,522 $ 184,893 $ 117,906 $ 1,251 $ 1,332,965 Investment income $ 33 $ 583 $ 4 $ 204 $ 326 $ 1,150 Amortization $ 32,743 $ 21,011 $ 7,915 $ 3,345 $ 11 $ 65,025 Depreciation $ 4,761 $ 5,881 $ 1,487 $ 1,432 $ 2,306 $ 15,867 Interest expense $ 29,415 $ 34,895 $ 2,472 $ 3,820 $ (40,985 ) $ 29,617 Income before income taxes $ 144,496 $ 68,367 $ 51,711 $ 17,929 $ 46,095 $ 328,598 Total assets $ 3,652,977 $ 2,933,568 $ 1,053,516 $ 342,360 $ (2,460,394 ) $ 5,522,027 Capital expenditures $ 4,664 $ 5,399 $ 925 $ 561 $ 1,586 $ 13,135

Investments

Investments	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments At September 30, 2017 , the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows: (in thousands) Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 32,724 $ 1 $ (94 ) $ 32,631 Corporate debt 1,407 16 — 1,423 Total $ 34,131 $ 17 $ (94 ) $ 34,054 At September 30, 2017 , the Company held $32.6 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipalities, and $1.4 million issued by corporations with investment grade ratings. Of that total, $20.0 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one-year. Additionally, the Company holds $9.2 million in short-term investments which are related to time deposits held with various financial institutions. For securities in a loss position, the following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2017 : Less than 12 Months 12 Months or More Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 24,444 $ (60 ) $ 7,364 $ (34 ) $ 31,808 $ (94 ) Corporate debt 200 — — — 200 — Total $ 24,644 $ (60 ) $ 7,364 $ (34 ) $ 32,008 $ (94 ) The unrealized losses were caused by interest rate increases. At September 30, 2017 , the Company had 27 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at September 30, 2017 . At December 31, 2016 , the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows: (in thousands) Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 26,280 $ 11 $ (59 ) $ 26,232 Corporate debt 2,358 13 (1 ) 2,370 Total $ 28,638 $ 24 $ (60 ) $ 28,602 At December 31, 2016 , the Company held $26.2 million in fixed income securities composed of U.S. Treasury securities, securities issued by U.S. Government agencies and municipalities, and $2.4 million issued by corporations with investment grade ratings. Of that total, $5.6 million is classified as short-term investments on the Consolidated Balance Sheet as maturities are less than one-year. Additionally, the Company holds $9.5 million in short-term investments which are related to time deposits held with various financial institutions. For securities in a loss position, the following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2016 : Less than 12 Months 12 Months or More Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 14,663 $ (59 ) $ — $ — $ 14,663 $ (59 ) Corporate debt 1,001 (1 ) — — 1,001 (1 ) Total $ 15,664 $ (60 ) $ — $ — $ 15,664 $ (60 ) The unrealized losses from corporate issuers were caused by interest rate increases. At December 31, 2016 , the Company had 20 securities in an unrealized loss position. The corporate securities are highly rated securities with no indicators of potential impairment. Based on the ability and intent of the Company to hold these investments until recovery of fair value, which may be maturity, the bonds were not considered to be other-than-temporarily impaired at December 31, 2016 . The amortized cost and estimated fair value of the fixed maturity securities at September 30, 2017 by contractual maturity are set forth below: (in thousands) Amortized Cost Fair Value Years to maturity: Due in one year or less $ 20,005 $ 19,969 Due after one year through five years 13,893 13,843 Due after five years 233 242 Total $ 34,131 $ 34,054 The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2016 by contractual maturity are set forth below: (in thousands) Amortized Cost Fair Value Years to maturity: Due in one year or less $ 5,551 $ 5,554 Due after one year through five years 22,757 22,708 Due after five years 330 340 Total $ 28,638 $ 28,602 The expected maturities in the foregoing table may differ from the contractual maturities because certain borrowers have the right to call or prepay obligations with or without penalty. Proceeds from the sales and maturity of the Company’s investment in fixed maturity securities were $2.7 million . This along with maturing time deposits yielded total cash proceeds from the sale of investments of $5.2 million in the period of January 1, 2017 to September 30, 2017 . These proceeds were used to purchase additional fixed maturity securities and time deposits. The gains and losses realized on those sales for the period from January 1, 2017 to September 30, 2017 were insignificant . Realized gains and losses are reported on the Condensed Consolidated Statements of Income, with the cost of securities sold determined on a specific identification basis. At September 30, 2017 , investments with a fair value of approximately $4.0 million were on deposit with state insurance departments to satisfy regulatory requirements.

Losses and Loss Adjustment Rese

Losses and Loss Adjustment Reserve	9 Months Ended
	Sep. 30, 2017
Reinsurance Disclosures [Abstract]
Losses and Loss Adjustment Reserve	Although the reinsurers are liable to the Company for amounts reinsured, our subsidiary, Wright National Flood Insurance Company (“Wright Flood”) remains primarily liable to its policyholders for the full amount of the policies written whether or not the reinsurers meet their obligations to the Company when they become due. The effects of reinsurance on premiums written and earned are as follows: Period from January 1, 2017 to (in thousands) Written Earned Direct premiums $ 462,718 $ 439,134 Ceded premiums (462,710 ) (439,126 ) Net premiums $ 8 $ 8 All premiums written by Wright Flood under the National Flood Insurance Program are 100% ceded to the Federal Emergency Management Agency, or FEMA, for which Wright Flood received a 30.9% expense allowance from January 1, 2017 through September 30, 2017 . For the period from January 1, 2017 through September 30, 2017 , the Company ceded $461.5 million of written premiums. Effective April 1, 2014, Wright Flood is also a party to a quota share agreement whereby it cedes 100% of its gross excess flood premiums, excluding fees, to Arch Reinsurance Company and receives a 30.5% commission. Wright Flood ceded $1.2 million for the period from January 1, 2017 through September 30, 2017 . No loss data exists on this agreement. Wright Flood also ceded 100% of the Homeowners, Private Passenger Auto Liability, and Other Liability Occurrence to Stillwater Insurance Company, formerly known as Fidelity National Insurance Company. This business is in runoff. Therefore, only loss data exists on this business. As of September 30, 2017 , no ceded unpaid losses and loss adjustment expenses or incurred but not reported expenses for Homeowners, Private Passenger Auto Liability and Other Liability Occurrence existed. As of September 30, 2017 the Condensed Consolidated Balance Sheet contained reinsurance recoverable of $2,160.3 million and prepaid reinsurance premiums of $332.2 million . There was no net activity in the reserve for losses and loss adjustment expense during the period January 1, 2017 through September 30, 2017 , as Wright Flood's direct premiums written were 100% ceded to two reinsurers. The balance of the reserve for losses and loss adjustment expense, excluding related reinsurance recoverable, as of September 30, 2017 was $2,160.3 million .

Statutory Financial Information

Statutory Financial Information	9 Months Ended
	Sep. 30, 2017
Statutory Accounting Practices [Abstract]
Statutory Financial Information	Statutory Financial Data Wright Flood maintains capital in excess of the minimum statutory amount of $7.5 million as required by regulatory authorities. The unaudited statutory capital and surplus of Wright Flood was $26.7 million at September 30, 2017 and $23.5 million as of December 31, 2016 . For the period from January 1, 2017 through September 30, 2017 , Wright Flood generated statutory net income of $2.9 million . For the period from January 1, 2016 through December 31, 2016 , Wright Flood generated statutory net income of $8.2 million .

Subsidiary Dividend Restriction

Subsidiary Dividend Restrictions	9 Months Ended
	Sep. 30, 2017
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Subsidiary Dividend Restrictions	Subsidiary Dividend Restrictions Under the insurance regulations of Texas, where Wright Flood is incorporated, the maximum amount of ordinary dividends that Wright Flood can pay to shareholders in a rolling twelve-month period is limited to the greater of 10% of statutory adjusted capital and surplus as shown on Wright Flood’s last annual statement on file with the superintendent of the Texas Department of Insurance or 100% of adjusted net income. There was no dividend payout in 2016 and the maximum dividend payout that may be made in 2017 without prior approval is $8.2 million .

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Between May 18, 2017 and June 30, 2017, the Company made share repurchases in the open market in total of 216,615 shares at a total cost of $11.2 million. Between July 1, 2017 and July 14, 2017, the Company made share repurchases in the open market in total of 131,845 shares at a total cost of $3.7 million. On August 14, 2017, the Company entered into an accelerated share repurchase agreement ("ASR") with an investment bank to purchase an aggregate $50.0 million of the Company's common stock. As part of the ASR, the company received an initial delivery of 967,888 shares of the Company's common stock with a fair market value of approximately $42.5 million. On October 16, 2017, the Company was notified by its investment bank that the accelerated share repurchase was completed. To complete the transaction, the investment bank delivered an additional 108,288 shares of the Company's common stock for a total of 1,076,176 shares repurchased under the ASR. Under the authorization from the Company’s Board of Directors, shares may be purchased from time to time, at the Company’s discretion and subject to the availability of stock, market conditions, the trading price of the stock, alternative uses for capital, the Company’s financial performance and other potential factors. These purchases may be carried out through open market purchases, block trades, accelerated share repurchase plans of up to $100.0 million each (unless otherwise approved by the Board of Directors), negotiated private transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934. After completion of this ASR transaction, the Company has approval to repurchase up to $302.4 million, in the aggregate, of the Company's outstanding common stock.

Nature of Operations (Policies)

Nature of Operations (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	four
Basis of Accounting	December 31, 2016 .
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding	For the three months For the nine months (in thousands, except per share data) 2017 2016 2017 2016 Net income $ 75,913 $ 71,545 $ 212,125 $ 199,865 Net income attributable to unvested awarded performance stock (1,852 ) (1,873 ) (5,181 ) (5,210 ) Net income attributable to common shares $ 74,061 $ 69,672 $ 206,944 $ 194,655 Weighted average number of common shares outstanding – basic 139,756 140,129 140,012 139,642 Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic (3,410 ) (3,668 ) (3,420 ) (3,640 ) Weighted average number of common shares outstanding for basic earnings per common share 136,346 136,461 136,592 136,002 Dilutive effect of stock options 2,547 1,721 2,419 1,582 Weighted average number of shares outstanding – diluted 138,893 138,182 139,011 137,584 Net income per share: Basic $ 0.54 $ 0.51 $ 1.52 $ 1.43 Diluted $ 0.53 $ 0.50 $ 1.49 $ 1.41

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Purchase price allocation for current year acquisitions and adjustments made for prior year acquisitions	(in thousands) Name Business Segment Effective Date of Acquisition Cash Paid Other Payable Recorded Earn-Out Payable Net Assets Acquired Maximum Potential Earn- Out Payable Other Various Various 26,478 11,395 1,332 39,205 11,605 Total $ 26,478 $ 11,395 $ 1,332 $ 39,205 $ 11,605
Estimated fair values of aggregate assets and liabilities acquired	The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition and adjustments made during the measurement period of the prior year acquisitions. (in thousands) Other Total Other current assets 98 98 Fixed assets 47 47 Goodwill 27,580 27,580 Purchased customer accounts 12,858 12,858 Non-compete agreements 595 595 Total assets acquired 41,178 41,178 Other current liabilities (1,284 ) (1,284 ) Deferred income tax, net (689 ) (689 ) Total liabilities assumed (1,973 ) (1,973 ) Net assets acquired $ 39,205 $ 39,205
Unaudited pro forma results	These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods. (UNAUDITED) For the three months For the nine months (in thousands, except per share data) 2017 2016 2017 2016 Total revenues $ 476,124 $ 465,014 $ 1,413,278 $ 1,341,511 Income before income taxes $ 124,582 $ 117,929 $ 345,608 $ 331,574 Net income $ 76,012 $ 72,130 $ 213,496 $ 201,675 Net income per share: Basic $ 0.54 $ 0.51 $ 1.52 $ 1.44 Diluted $ 0.53 $ 0.51 $ 1.50 $ 1.43 Weighted average number of shares outstanding: Basic 136,346 136,461 136,592 136,002 Diluted 138,893 138,182 139,011 137,584
Additions, payments, and net changes, as well as interest expense accretion on estimated acquisition earn-out payables	The resulting additions, payments, and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the three and nine months ended September 30, 2017 and 2016 , were as follows: For the three months For the nine months (in thousands) 2017 2016 2017 2016 Balance as of the beginning of the period $ 57,943 $ 73,447 $ 63,821 $ 78,387 Additions to estimated acquisition earn-out payables 1,050 1,437 1,332 3,828 Payments for estimated acquisition earn-out payables (23,511 ) (16,988 ) (39,288 ) (27,555 ) Subtotal 35,482 57,896 25,865 54,660 Net change in earnings from estimated acquisition earn-out payables: Change in fair value on estimated acquisition earn-out payables (1,784 ) 2,883 6,402 4,704 Interest expense accretion 476 727 1,907 2,142 Net change in earnings from estimated acquisition earn-out payables (1,308 ) 3,610 8,309 6,846 Balance as of September 30, $ 34,174 $ 61,506 $ 34,174 $ 61,506

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Value of Goodwill by Operating Segment	nine months ended September 30, 2017 are as follows: (in thousands) Retail National Programs Wholesale Brokerage Services Total Balance as of January 1, 2017 $ 1,354,667 $ 901,294 $ 284,869 $ 134,572 $ 2,675,402 Goodwill of acquired businesses 18,807 7,314 770 689 27,580 Goodwill disposed of relating to sales of businesses (1,494 ) — — — (1,494 ) Balance as of September 30, 2017 $ 1,371,980 $ 908,608 $ 285,639 $ 135,261 $ 2,701,488

Amortizable Intangible Assets (

Amortizable Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortizable Intangible Assets	Amortizable intangible assets at September 30, 2017 and December 31, 2016 consisted of the following: September 30, 2017 December 31, 2016 (in thousands) Gross Carrying Value Accumulated Amortization Net Carrying Value Weighted Average Life (Years) (1) Gross Carrying Value Accumulated Amortization Net Carrying Value Weighted Average Life (Years) (1) Purchased customer accounts $ 1,458,405 $ (803,764 ) $ 654,641 15.0 $ 1,447,680 $ (741,770 ) $ 705,910 15.0 Non-compete agreements 30,161 (28,748 ) 1,413 6.8 29,668 (28,124 ) 1,544 6.8 Total $ 1,488,566 $ (832,512 ) $ 656,054 $ 1,477,348 $ (769,894 ) $ 707,454 (1) Weighted average life calculated as of the date of acquisition.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt Instrument	Long-term debt at September 30, 2017 and December 31, 2016 consisted of the following: (in thousands) September 30, December 31, 2016 Current portion of long-term debt: Current portion of 5-year term loan facility expires June 28, 2022 $ 20,000 $ 55,000 4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 100,000 — Short-term promissory note — 500 Total current portion of long-term debt 120,000 55,500 Long-term debt: Note agreements: 4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 — 100,000 4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024 498,904 498,785 Total notes 498,904 598,785 Credit agreements: 5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022 370,000 426,250 5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022 — — Total credit agreements 370,000 426,250 Debt issuance costs (contra) (8,163 ) (6,663 ) Total long-term debt less unamortized discount and debt issuance costs 860,741 1,018,372 Current portion of long-term debt 120,000 55,500 Total debt $ 980,741 $ 1,073,872

Supplemental Disclosures of C27

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities	For the nine months (in thousands) 2017 2016 Cash paid during the period for: Interest $ 32,504 $ 33,122 Income taxes $ 110,853 $ 104,739 Brown & Brown’s significant non-cash investing and financing activities are summarized as follows: For the nine months (in thousands) 2017 2016 Other payable issued for purchased customer accounts $ 11,395 $ 10,505 Estimated acquisition earn-out payables and related charges $ 1,332 $ 3,828 Notes payable issued or assumed for purchased customer accounts $ — $ 492

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting Information [Line Items]
Segment Information	Segment Information Brown & Brown’s business is divided into four reportable segments:(1) the Retail Segment, which provides a broad range of insurance products and services to commercial, public and quasi-public entities, and to professional and individual customers; (2) the National Programs Segment, which acts as a MGA, provides professional liability and related package products for certain professionals, a range of insurance products for individuals, flood coverage, and targeted products and services designated for specific industries, trade groups, governmental entities and market niches, all of which are delivered through nationwide networks of independent agents, and Brown & Brown retail agents; (3) the Wholesale Brokerage Segment, which markets and sells excess and surplus commercial and personal lines insurance, primarily through independent agents and brokers, as well as Brown & Brown retail agents; and (4) the Services Segment, which provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare Set-aside services, Social Security disability and Medicare benefits advocacy services and claims adjusting services. Brown & Brown conducts all of its operations within the United States of America, except for a wholesale brokerage operation based in London, England, and retail operations in Bermuda and the Cayman Islands. These operations earned $3.9 million and $3.8 million of total revenues for the three months ended September 30, 2017 and 2016 , respectively. These operations earned $11.1 million and $10.3 million of total revenues for the nine months ended September 30, 2017 and 2016 , respectively. Long-lived assets held outside of the United States as of September 30, 2017 and 2016 were not material. The accounting policies of the reportable segments are the same as those described in Note 1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . The Company evaluates the performance of its segments based upon revenues and income before income taxes. Inter-segment revenues are eliminated. Summarized financial information concerning the Company’s reportable segments is shown in the following table. The “Other” column includes any income and expenses not allocated to reportable segments, corporate-related items, including the inter-company interest expense charge to the reporting segment, and the elimination of inter-segment activities. For the three months ended September 30, 2017 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 234,483 $ 127,718 $ 71,574 $ 41,491 $ 380 $ 475,646 Investment income $ 3 $ 124 $ — $ 72 $ 292 $ 491 Amortization $ 10,540 $ 6,913 $ 2,845 $ 1,137 $ — $ 21,435 Depreciation $ 1,262 $ 1,412 $ 471 $ 402 $ 1,942 $ 5,489 Interest expense $ 7,216 $ 8,304 $ 1,515 $ 876 $ (8,518 ) $ 9,393 Income before income taxes $ 54,950 $ 32,203 $ 21,219 $ 7,910 $ 8,137 $ 124,419 Total assets $ 4,246,422 $ 5,026,918 $ 1,258,783 $ 432,331 $ (3,550,177 ) $ 7,414,277 Capital expenditures $ 844 $ 1,357 $ 214 $ 364 $ 1,270 $ 4,049 For the three months ended September 30, 2016 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 228,645 $ 123,632 $ 70,192 $ 39,586 $ 219 $ 462,274 Investment income $ 5 $ 96 $ — $ 57 $ 72 $ 230 Amortization $ 10,861 $ 6,921 $ 2,882 $ 1,140 $ 1 $ 21,805 Depreciation $ 1,508 $ 1,945 $ 503 $ 473 $ 766 $ 5,195 Interest expense $ 9,026 $ 10,844 $ 1,540 $ 1,257 $ (12,784 ) $ 9,883 Income before income taxes $ 44,894 $ 32,319 $ 20,862 $ 5,971 $ 12,926 $ 116,972 Total assets $ 3,652,977 $ 2,933,568 $ 1,053,516 $ 342,360 $ (2,460,394 ) $ 5,522,027 Capital expenditures $ 1,443 $ 2,153 $ 11 $ 80 $ 504 $ 4,191 For the nine months ended September 30, 2017 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 712,739 $ 342,576 $ 208,812 $ 122,397 $ 20,507 $ 1,407,031 Investment income $ 6 $ 279 $ — $ 224 $ 576 $ 1,085 Amortization $ 31,704 $ 20,664 $ 8,621 $ 3,412 $ 1 $ 64,402 Depreciation $ 3,975 $ 4,975 $ 1,438 $ 1,191 $ 5,663 $ 17,242 Interest expense $ 23,918 $ 27,257 $ 4,803 $ 2,783 $ (29,812 ) $ 28,949 Income before income taxes $ 151,783 $ 68,127 $ 56,569 $ 22,480 $ 44,429 $ 343,388 Total assets $ 4,246,422 $ 5,026,918 $ 1,258,783 $ 432,331 $ (3,550,177 ) $ 7,414,277 Capital expenditures $ 3,384 $ 3,885 $ 1,606 $ 856 $ 3,166 $ 12,897 For the nine months ended September 30, 2016 (in thousands) Retail National Programs Wholesale Brokerage Services Other Total Total revenues $ 695,393 $ 333,522 $ 184,893 $ 117,906 $ 1,251 $ 1,332,965 Investment income $ 33 $ 583 $ 4 $ 204 $ 326 $ 1,150 Amortization $ 32,743 $ 21,011 $ 7,915 $ 3,345 $ 11 $ 65,025 Depreciation $ 4,761 $ 5,881 $ 1,487 $ 1,432 $ 2,306 $ 15,867 Interest expense $ 29,415 $ 34,895 $ 2,472 $ 3,820 $ (40,985 ) $ 29,617 Income before income taxes $ 144,496 $ 68,367 $ 51,711 $ 17,929 $ 46,095 $ 328,598 Total assets $ 3,652,977 $ 2,933,568 $ 1,053,516 $ 342,360 $ (2,460,394 ) $ 5,522,027 Capital expenditures $ 4,664 $ 5,399 $ 925 $ 561 $ 1,586 $ 13,135

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Investments in Fixed Maturity Securities	At December 31, 2016 , the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows: (in thousands) Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 26,280 $ 11 $ (59 ) $ 26,232 Corporate debt 2,358 13 (1 ) 2,370 Total $ 28,638 $ 24 $ (60 ) $ 28,602 At September 30, 2017 , the Company’s amortized cost and fair values of fixed maturity securities are summarized as follows: (in thousands) Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 32,724 $ 1 $ (94 ) $ 32,631 Corporate debt 1,407 16 — 1,423 Total $ 34,131 $ 17 $ (94 ) $ 34,054
Summary of Unrealized Loss Position	December 31, 2016 : Less than 12 Months 12 Months or More Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 14,663 $ (59 ) $ — $ — $ 14,663 $ (59 ) Corporate debt 1,001 (1 ) — — 1,001 (1 ) Total $ 15,664 $ (60 ) $ — $ — $ 15,664 $ (60 ) he following table shows the investments’ gross unrealized loss and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2017 : Less than 12 Months 12 Months or More Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities $ 24,444 $ (60 ) $ 7,364 $ (34 ) $ 31,808 $ (94 ) Corporate debt 200 — — — 200 — Total $ 24,644 $ (60 ) $ 7,364 $ (34 ) $ 32,008 $ (94 )
Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity	The amortized cost and estimated fair value of the fixed maturity securities at September 30, 2017 by contractual maturity are set forth below: (in thousands) Amortized Cost Fair Value Years to maturity: Due in one year or less $ 20,005 $ 19,969 Due after one year through five years 13,893 13,843 Due after five years 233 242 Total $ 34,131 $ 34,054 The amortized cost and estimated fair value of the fixed maturity securities at December 31, 2016 by contractual maturity are set forth below: (in thousands) Amortized Cost Fair Value Years to maturity: Due in one year or less $ 5,551 $ 5,554 Due after one year through five years 22,757 22,708 Due after five years 330 340 Total $ 28,638 $ 28,602

Losses and Loss Adjustment Re30

Losses and Loss Adjustment Reserve (Tables)	9 Months Ended
	Sep. 30, 2017
Reinsurance Disclosures [Abstract]
Effects of Reinsurance on Premiums Written and Earned	The effects of reinsurance on premiums written and earned are as follows: Period from January 1, 2017 to (in thousands) Written Earned Direct premiums $ 462,718 $ 439,134 Ceded premiums (462,710 ) (439,126 ) Net premiums $ 8 $ 8

Nature of Operations - Addition

Nature of Operations - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	4

Basis of Financial Reporting Te

Basis of Financial Reporting Text Block (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Text Block [Abstract]
Operating Leases, Future Minimum Payments Due	$ 200,300		$ 213,200
Share-based Compensation	$ 22,362	$ 11,593

Net Income Per Share - Reconcil

Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 75,913	$ 71,545	$ 212,125	$ 199,865
Net income attributable to unvested awarded performance stock	(1,852)	(1,873)	(5,181)	(5,210)
Net income attributable to common shares	$ 74,061	$ 69,672	$ 206,944	$ 194,655
Weighted average number of common shares outstanding - basic (in shares)	139,756	140,129	140,012	139,642
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares)	(3,410)	(3,668)	(3,420)	(3,640)
Weighted average number of common shares outstanding for basic earnings per common share (in shares)	136,346	136,461	136,592	136,002
Dilutive effect of stock options (in shares)	2,547	1,721	2,419	1,582
Weighted average number of shares outstanding - diluted (in shares)	138,893	138,182	139,011	137,584
Basic (in dollars per share)	$ 0.54	$ 0.51	$ 1.52	$ 1.43
Diluted (in dollars per share)	$ 0.53	$ 0.50	$ 1.49	$ 1.41

Business Combinations - Additio

Business Combinations - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)acquisition	Sep. 30, 2016USD ($)acquisition	Apr. 01, 2016USD ($)	Jan. 01, 2016USD ($)	Apr. 01, 2015USD ($)	Jan. 01, 2015USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 41,178,000	$ 41,178,000
Number of acquisitions | acquisition		6	6
Aggregate purchase price of acquisitions		$ 1,406,263
Payments to Acquire Businesses, Gross		26,478,000	$ 115,300,000
Goodwill assigned	27,580,000	27,580,000
Goodwill currently deductible for income tax purposes	26,248,000	26,248,000
Goodwill related to the recorded earn-out payables	1,333,000	1,333,000
Total revenues related to acquisitions	3,191,000	3,645,000
Income before income taxes related to acquisitions	864,000	979,000
Estimated acquisition earn-out payables	34,174,000	34,174,000	$ 61,506,000	$ 57,943,000	$ 63,821,000	$ 73,447,000	$ 78,387,000
Maximum Future Contingency payments Acquisitions	81,500,000	81,500,000
Accounts payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	28,700,000	$ 28,700,000
Purchased customer accounts
Business Acquisition [Line Items]
Weighted average life (years)		15 years
Non-compete agreements
Business Acquisition [Line Items]
Weighted average life (years)		5 years
Services
Business Acquisition [Line Items]
Goodwill assigned	18,807,000	$ 18,807,000
National Programs
Business Acquisition [Line Items]
Goodwill assigned	7,314,000	7,314,000
Wholesale Brokerage
Business Acquisition [Line Items]
Goodwill assigned	771,000	771,000
Services [Member]
Business Acquisition [Line Items]
Goodwill assigned	689,000	689,000
Other non-current liability
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	5,500,000	$ 5,500,000
Business Combinations - Asset Deals [Member]
Business Acquisition [Line Items]
Number of acquisitions | acquisition		6
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	41,178,000	$ 41,178,000
Goodwill assigned	$ 27,580,000	$ 27,580,000

Business Combinations - Acquisi

Business Combinations - Acquisitions Accounted for Business Combinations (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 1,973
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	41,178
Cash Paid	26,478	$ 115,300
Other Payable	11,395
Recorded Earn-Out Payable	1,332
Net Assets Acquired	39,205
Maximum Potential Earn- Out Payable	11,605
Other current assets	98
Fixed assets	47
Goodwill	27,580
Purchased customer accounts	12,858
Non-compete agreements	595
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	1,284
Deferred Tax Liabilities, Net	689
Services [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill	689
Services
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill	18,807
National Programs
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill	7,314
Wholesale Brokerage
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill	771
Other Acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,973
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	41,178
Net Assets Acquired	39,205
Other current assets	98
Fixed assets	47
Goodwill	27,580
Purchased customer accounts	12,858
Non-compete agreements	595
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	1,284
Deferred Tax Liabilities, Net	689
Other Acquisitions [Member] | Various
Business Combination, Separately Recognized Transactions [Line Items]
Cash Paid	26,478
Other Payable	11,395
Recorded Earn-Out Payable	1,332
Net Assets Acquired	39,205
Maximum Potential Earn- Out Payable	$ 11,605

Business Combinations - Estimat

Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value Of Assets And Liabilities Statement [Line Items]
Payments to Acquire Businesses, Gross	$ 26,478	$ 115,300
Recorded Earn-Out Payable	1,332
Other current assets	98
Fixed assets	47
Goodwill	27,580
Purchased customer accounts	12,858
Non-compete agreements	595
Total assets acquired	41,178
Other current liabilities	(1,284)
Deferred Tax Liabilities, Net	(689)
Total liabilities assumed	(1,973)
Net assets acquired	39,205
Maximum Potential Earn- Out Payable	11,605
Other Acquisitions [Member]
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	98
Fixed assets	47
Goodwill	27,580
Purchased customer accounts	12,858
Non-compete agreements	595
Total assets acquired	41,178
Other current liabilities	(1,284)
Deferred Tax Liabilities, Net	(689)
Total liabilities assumed	(1,973)
Net assets acquired	39,205
Wholesale Brokerage
Fair Value Of Assets And Liabilities Statement [Line Items]
Goodwill	$ 771

Business Combinations - Results

Business Combinations - Results of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 3,191		$ 3,645
Business Combination Pro Forma Information Income Loss Before Income Taxes Of Acquiree Since Acquisition Date Actual	864		979
Total revenues	476,124	$ 465,014	1,413,278	$ 1,341,511
Income before income taxes	124,582	117,929	345,608	331,574
Net income	$ 76,012	$ 72,130	$ 213,496	$ 201,675
Net income per share:
Basic (in dollars per share)	$ 0.54	$ 0.51	$ 1.52	$ 1.44
Diluted (in dollars per share)	$ 0.53	$ 0.51	$ 1.50	$ 1.43
Weighted Average Basic Shares Outstanding, Pro Forma	136,346	136,461	136,592	136,002
Weighted average number of shares outstanding:
Pro Forma Weighted Average Shares Outstanding, Diluted	138,893	138,182	139,011	137,584

Business Combinations - Addit38

Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Combinations [Abstract]
Additions to estimated acquisition earn-out payables	$ 1,050	$ 1,437	$ 1,332	$ 3,828
Payments for estimated acquisition earn-out payables	(23,511)	(16,988)	(39,288)	(27,555)
Subtotal	35,482	57,896	25,865	54,660
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	(1,784)	2,883	6,402	4,704
Interest expense accretion	476	727	1,907	2,142
Net change in earnings from estimated acquisition earn-out payables	(1,308)	3,610	8,309	6,846
Ending balance	$ 34,174	$ 61,506	$ 34,174	$ 61,506

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	$ 1,494
Beginning balance	2,675,402
Goodwill of acquired businesses	27,580
Ending balance	2,701,488
Services
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	1,494
Beginning balance	1,354,667
Goodwill of acquired businesses	18,807
Ending balance	1,371,980
National Programs
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	0
Beginning balance	901,294
Goodwill of acquired businesses	7,314
Ending balance	908,608
Wholesale Brokerage
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	0
Beginning balance	284,869
Goodwill of acquired businesses	770
Ending balance	285,639
Services
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	0
Beginning balance	134,572
Goodwill of acquired businesses	689
Ending balance	$ 135,261

Amortizable Intangible Assets -

Amortizable Intangible Assets - Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,488,566		$ 1,477,348
Accumulated Amortization	(832,512)		(769,894)
Net Carrying Value	656,054		707,454
Purchased customer accounts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,458,405		1,447,680
Accumulated Amortization	(803,764)		(741,770)
Net Carrying Value	$ 654,641		705,910
Weighted Average Life (Years)	15 years	15 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 30,161		29,668
Accumulated Amortization	(28,748)		(28,124)
Net Carrying Value	$ 1,413		$ 1,544
Weighted Average Life (Years)	6 years 9 months 18 days	6 years 9 months 18 days

Amortizable Intangible Assets41

Amortizable Intangible Assets - Additional Information (Detail) $ in Millions	Sep. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense estimated, year one (2015)	$ 85.3
Amortization expense estimated, year two (2016)	80.6
Amortization expense estimated, year three (2017)	76.1
Amortization expense estimated, year four (2018)	68.7
Amortization expense estimated, year five (2019)	$ 65.4

Long-Term Debt - Long-Term Debt

Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Jan. 15, 2015
Debt Instrument [Line Items]
Document Period End Date	Sep. 30, 2017
Total current portion of long-term debt	$ 120,000	$ 55,500
Total notes	498,904	598,785
Long-term credit agreements	370,000	426,250
Debt Issuance Costs, Gross	(8,163)	(6,663)
Total long-term debt	860,741	1,018,372
Current portion of long-term debt	120,000	55,500
Total debt	980,741	1,073,872
Notes Payable, Current	0	500
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016
Debt Instrument [Line Items]
Current portion of senior notes			$ 25,000
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018
Debt Instrument [Line Items]
Total notes	0	100,000
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024
Debt Instrument [Line Items]
Total notes	498,904	498,785
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022
Debt Instrument [Line Items]
Current portion of loan facility	20,000	55,000
Long-term credit agreements	370,000	426,250
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022
Debt Instrument [Line Items]
Long-term credit agreements	$ 0	$ 0

Long-Term Debt - Long-Term De43

Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 18, 2014	Sep. 15, 2011
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		0.81%
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018
Debt Instrument [Line Items]
Debt instrument maturity year	2,018	2,018
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.20%
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024
Debt Instrument [Line Items]
Debt instrument maturity year	2,024	2,024
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022
Debt Instrument [Line Items]
Line of credit facility, expiration period	5 years	5 years
Line of credit facility, expiration date	Jun. 28, 2022	May 20, 2019
Five Year Term Loan Facility Expires In Two Thousand Ninteen Current [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2,022	2,019
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022
Debt Instrument [Line Items]
Line of credit facility, expiration period	5 years	5 years
Line of credit facility, expiration date	Jun. 28, 2022	May 20, 2019
Maximum | Term Loan [Member] | LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%	1.75%
Revolving Credit Facility [Member] | Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.25%	0.25%
Revolving Credit Facility [Member] | Maximum | LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.50%	1.50%
Series E [Member] | Master Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.50%

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Detail)

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2017USD ($)

Sep. 30, 2017USD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2017USD ($)

Jun. 28, 2017USD ($)

Jan. 15, 2015USD ($)

Sep. 18, 2014USD ($)

May 20, 2014USD ($)extension

Apr. 17, 2014USD ($)

Sep. 15, 2011USD ($)

Feb. 01, 2008USD ($)

Dec. 22, 2006USD ($)

Debt Instrument [Line Items]

Document Period End Date

Sep. 30, 2017

Debt instrument interest rate stated percentage

0.81%

Credit facility, outstanding amount

$ 370,000,000

$ 370,000,000

$ 426,250,000

Potential increased in line of credit facility

$ 500,000,000

Unsecured revolving credit facility

$ 400,000,000

800,000,000

Write off of Deferred Debt Issuance Cost

200,000

Debt Issuance Costs, Noncurrent, Net

1,600,000

Debt Instrument, Periodic Payment, Principal

5,000,000

Proceeds from Issuance of Debt

2,800,000

Unsecured term loans

$ 390,000,000

550,000,000

Outstanding debt balance

980,741,000

980,741,000

1,073,872,000

Notes Payable, Current

0

0

500,000

5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016

Debt Instrument [Line Items]

Current portion of senior notes

$ 25,000,000

Credit Agreement

Debt Instrument [Line Items]

Number of extension periods | extension

2

Unsecured revolving credit facility

$ 1,350,000,000

Unsecured Senior Notes

Debt Instrument [Line Items]

Debt instrument interest rate stated percentage

4.20%

Debt instrument, face amount

$ 500,000,000

Outstanding debt balance

500,000,000

500,000,000

500,000,000

Term Loan

Debt Instrument [Line Items]

Credit facility, outstanding amount

$ 550,000,000

Debt Instrument, Periodic Payment, Principal

67,500,000

Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Credit facility, outstanding amount

$ 475,000,000

$ 375,000,000

Uncommitted Facility | New Master Agreement

Debt Instrument [Line Items]

Credit facility, outstanding amount

$ 0

Master Agreement

Debt Instrument [Line Items]

Unsecured senior notes outstanding

$ 100,000,000

$ 100,000,000

Master Agreement | Series C

Debt Instrument [Line Items]

Unsecured senior notes outstanding

$ 25,000,000

$ 25,000,000

Debt instrument interest rate stated percentage

5.66%

Master Agreement | Series D

Debt Instrument [Line Items]

Debt instrument interest rate stated percentage

5.37%

Master Agreement | Series E

Debt Instrument [Line Items]

Unsecured senior notes outstanding

$ 100,000,000

Debt instrument interest rate stated percentage

4.50%

LIBOR

Debt Instrument [Line Items]

30-day Adjusted LIBOR Rate

1.25%

1.25%

Minimum | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Facility fee

0.15%

Minimum | LIBOR | Term Loan

Debt Instrument [Line Items]

Debt instrument, variable interest rate

1.00%

Minimum | LIBOR | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Debt instrument, variable interest rate

0.85%

Maximum | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Facility fee

0.25%

0.25%

Maximum | LIBOR | Term Loan

Debt Instrument [Line Items]

Debt instrument, variable interest rate

1.75%

1.75%

Maximum | LIBOR | Revolving Credit Facility [Member]

Debt Instrument [Line Items]

Debt instrument, variable interest rate

1.50%

1.50%

Scenario, Forecast [Member]

Debt Instrument [Line Items]

Unsecured senior notes outstanding

$ 5,000,000

Supplemental Disclosures of C45

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]
Document Period End Date	Sep. 30, 2017
Cash and cash equivalents	$ 546,520,000	$ 488,683,000	$ 515,646,000	$ 443,420,000
Restricted Cash and Cash Equivalents	276,687,000	278,279,000	265,637,000	229,753,000
Cash paid during the period for:
Interest	32,504,000	33,122,000
Income taxes	110,853,000	104,739,000
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	11,395,000	10,505,000
Estimated acquisition earn-out payables and related charges	1,332,000	3,828,000
Business Acquisition Cost of Entity Note Payable	0	492,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 823,207,000	$ 766,962,000	$ 781,283,000	$ 673,173,000

Supplemental Disclosures of C46

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities Restricted Cash (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents	$ 546,520,000	$ 488,683,000	$ 515,646,000	$ 443,420,000
Cash and Cash Equivalents, at Carrying Value	823,207,000	766,962,000	781,283,000	673,173,000
Restricted Cash and Cash Equivalents	276,687,000	278,279,000	265,637,000	229,753,000
Cash and Cash Equivalents inclusive of Restricted Cash [Member]
Cash and cash equivalents	$ 823,207,000	$ 766,962,000	$ 781,283,000	$ 673,173,000

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)Segment	Sep. 30, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			4
Total revenues	$ 475,646	$ 462,274	$ 1,407,031	$ 1,332,965
London, Bermuda and Cayman Islands
Segment Reporting Information [Line Items]
Total revenues	$ 3,900	$ 3,800	$ 11,100	$ 10,300

Segment Information - Summarize

Segment Information - Summarized Financial Information Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 475,646	$ 462,274	$ 1,407,031	$ 1,332,965
Investment income	491	230	1,085	1,150
Amortization	21,435	21,805	64,402	65,025
Depreciation	5,489	5,195	17,242	15,867
Interest expense	9,393	9,883	28,949	29,617
Income before income taxes	124,419	116,972	343,388	328,598
Total assets	7,414,277	5,522,027	7,414,277	5,522,027	$ 5,262,734
Capital expenditures	4,049	4,191	12,897	13,135
Operating Segments | Services
Segment Reporting Information [Line Items]
Total revenues	234,483	228,645	712,739	695,393
Investment income	3	5	6	33
Amortization	10,540	10,861	31,704	32,743
Depreciation	1,262	1,508	3,975	4,761
Interest expense	7,216	9,026	23,918	29,415
Income before income taxes	54,950	44,894	151,783	144,496
Total assets	4,246,422	3,652,977	4,246,422	3,652,977
Capital expenditures	844	1,443	3,384	4,664
Operating Segments | National Programs
Segment Reporting Information [Line Items]
Total revenues	127,718	123,632	342,576	333,522
Investment income	124	96	279	583
Amortization	6,913	6,921	20,664	21,011
Depreciation	1,412	1,945	4,975	5,881
Interest expense	8,304	10,844	27,257	34,895
Income before income taxes	32,203	32,319	68,127	68,367
Total assets	5,026,918	2,933,568	5,026,918	2,933,568
Capital expenditures	1,357	2,153	3,885	5,399
Operating Segments | Wholesale Brokerage
Segment Reporting Information [Line Items]
Total revenues	71,574	70,192	208,812	184,893
Investment income	0	0	0	4
Amortization	2,845	2,882	8,621	7,915
Depreciation	471	503	1,438	1,487
Interest expense	1,515	1,540	4,803	2,472
Income before income taxes	21,219	20,862	56,569	51,711
Total assets	1,258,783	1,053,516	1,258,783	1,053,516
Capital expenditures	214	11	1,606	925
Operating Segments | Services
Segment Reporting Information [Line Items]
Total revenues	41,491	39,586	122,397	117,906
Investment income	72	57	224	204
Amortization	1,137	1,140	3,412	3,345
Depreciation	402	473	1,191	1,432
Interest expense	876	1,257	2,783	3,820
Income before income taxes	7,910	5,971	22,480	17,929
Total assets	432,331	342,360	432,331	342,360
Capital expenditures	364	80	856	561
Other
Segment Reporting Information [Line Items]
Total revenues	380	219	20,507	1,251
Investment income	292	72	576	326
Amortization	0	1	1	11
Depreciation	1,942	766	5,663	2,306
Interest expense	(8,518)	(12,784)	(29,812)	(40,985)
Income before income taxes	8,137	12,926	44,429	46,095
Total assets	(3,550,177)	(2,460,394)	(3,550,177)	(2,460,394)
Capital expenditures	$ 1,270	$ 504	$ 3,166	$ 1,586

Investments - Schedule of Inves

Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Single Maturity Date	$ 9,200	$ 9,500
Cost	34,131	28,638
Gross Unrealized Gains	17	24
Gross Unrealized Losses	(94)	(60)
Fair Value	34,054	28,602
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Schedule of Available-for-sale Securities [Line Items]
Cost	32,724	26,280
Gross Unrealized Gains	1	11
Gross Unrealized Losses	(94)	(59)
Fair Value	32,631	26,232
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	1,407	2,358
Gross Unrealized Gains	16	13
Gross Unrealized Losses	0	(1)
Fair Value	$ 1,423	$ 2,370

Investments - Summary of Unreal

Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 24,644	$ 15,664
Unrealized Losses, Less than 12 Months	(60)	(60)
Fair Value, 12 Months or More	7,364	0
Unrealized Losses, 12 Months or More	34	0
Fair Value	32,008	15,664
Unrealized Losses	(94)	(60)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	24,444	14,663
Unrealized Losses, Less than 12 Months	(60)	(59)
Fair Value, 12 Months or More	7,364	0
Unrealized Losses, 12 Months or More	34	0
Fair Value	31,808	14,663
Unrealized Losses	(94)	(59)
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	200	1,001
Unrealized Losses, Less than 12 Months	0	(1)
Fair Value, 12 Months or More	0	0
Unrealized Losses, 12 Months or More	0	0
Fair Value	200	1,001
Unrealized Losses	$ 0	$ (1)

Investments - Additional Inform

Investments - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)Securities	Dec. 31, 2016USD ($)Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 34,054	$ 28,602
Number of securities in unrealized loss position | Securities	27	20
Proceeds from sale of investment in fixed maturity securities	$ 2,700
Proceeds from Sale of Other Investments	$ 5,200
Investment security maturity date, start	Jan. 1, 2017
Investment security maturity date, End	Sep. 30, 2017
Gross realized gains and losses of securities	insignificant
Investments on deposit with the state insurance department	$ 4,000
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 32,631	$ 26,232

Investments - Amortized Cost an

Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 20,005	$ 5,551
Due after one year through five years	13,893	22,757
Due after five years	233	330
Amortized Cost, Total	34,131	28,638
Fair Value
Due in one year or less	19,969	5,554
Due after one year through five years	13,843	22,708
Due after five years	242	340
Fair Value, Total	$ 34,054	$ 28,602

Losses and Loss Adjustment Re53

Losses and Loss Adjustment Reserve - Effects of Reinsurance on Premiums Written and Earned (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Written
Direct premiums	$ 462,718
Ceded premiums	(462,710)
Net premiums	8
Earned
Direct premiums	439,134
Ceded premiums	(439,126)
Net premiums	$ 8

Losses and Loss Adjustment Re54

Losses and Loss Adjustment Reserve - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)Reinsurer	Dec. 31, 2016USD ($)
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Premiums written net	$ 462,710,000
Ceded unpaid loss	2,160,300,000
Prepaid reinsurance premiums	332,246,000	$ 308,661,000
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve	0
Reserve for losses and loss adjustment expense	$ 2,160,300,000
Number of reinsurers | Reinsurer	2
Wright Flood
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded rate of premiums under insurance program	100.00%
Expenses and allowance rate received in premiums	30.90%
Premiums written net	$ 461,500,000
Wright Flood | Quota Share Agreement
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Effective cedes rate under quota share agreement	100.00%
Commission rate, percent of ceded written premiums	30.50%
Ceded amount	$ 1,200,000

Statutory Financial Informati55

Statutory Financial Information - Additional Information (Detail) - Wright Flood - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Statutory capital and surplus required	$ 7,500,000
Statutory capital and surplus	26,700,000	$ 23,500,000
Statutory net Income	$ 2,900,000	$ 8,200,000

Subsidiary Dividend Restricti56

Subsidiary Dividend Restrictions - Additional Information (Detail) - Wright Flood $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	100.00%
Ordinary dividends payment description	The maximum amount of ordinary dividends that Wright Flood can pay to shareholders in a rolling twelve month period is limited to the greater of 10% of statutory adjusted capital and surplus as shown on Wright Flood’s last annual statement on file with the superintendent or 100% of adjusted net income.
Maximum dividend payout that may be made without prior approval	$ 8.2
Maximum
Dividend Restrictions [Line Items]
Dividend rate as a percentage of net income	10.00%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accelerated Share Repurchases [Line Items]
Shares repurchased, number of shares received initially (in shares)	9,319,545	8,003,197
Fair value of common stock repurchased	$ 315,072	$ 257,683
Repurchase Agreements [Member]
Accelerated Share Repurchases [Line Items]
Shares repurchased, authorized amount	$ 100,000