Patterson-UTI Energy (PTEN) 10-Q 31 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 27, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	PTEN
Entity Registrant Name	PATTERSON UTI ENERGY INC
Entity Central Index Key	889,900
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		148,110,448

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 36,972	$ 113,346
Accounts receivable, net of allowance for doubtful accounts of $3,191 and $3,545 at September 30, 2016 and December 31, 2015, respectively	146,013	219,672
Federal and state income taxes receivable	3,838	33,454
Inventory	19,851	14,716
Deferred tax assets, net	34,897	65,121
Other	38,722	40,227
Total current assets	280,293	486,536
Property and equipment, net	3,511,740	3,920,708
Goodwill and intangible assets	89,877	92,609
Deposits on equipment purchases	17,700	22,367
Other	9,263	7,264
Total assets	3,908,873	4,529,484
Current liabilities:
Accounts payable	82,163	82,771
Accrued expenses	154,228	161,611
Current portion of long-term debt, net of debt issuance cost of $483 at December 31, 2015		63,267
Total current liabilities	236,391	307,649
Borrowings under revolving credit facility	15,000
Long-term debt, net of debt issuance cost of $1,649 and $3,350 at September 30, 2016 and December 31, 2015, respectively	598,351	787,900
Deferred tax liabilities, net	724,564	863,833
Other	10,441	8,971
Total liabilities	1,584,747	1,968,353
Commitments and contingencies (see Note 9)
Stockholders' equity:
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued
Common stock, par value $.01; authorized 300,000,000 shares with 191,494,741 and 190,374,801 issued and 148,118,449 and 147,167,561 outstanding at September 30, 2016 and December 31, 2015, respectively	1,915	1,904
Additional paid-in capital	1,034,768	1,011,811
Retained earnings	2,197,424	2,458,554
Accumulated other comprehensive income (loss)	675	(4,093)
Treasury stock, at cost, 43,376,292 and 43,207,240 shares at September 30, 2016 and December 31, 2015, respectively	(910,656)	(907,045)
Total stockholders' equity	2,324,126	2,561,131
Total liabilities and stockholders' equity	$ 3,908,873	$ 4,529,484

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 3,191	$ 3,545
Current portion of long-term debt, debt issuance cost		483
Long-term debt, debt issuance cost	$ 1,649	$ 3,350
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	191,494,741	190,374,801
Common stock, outstanding	148,118,449	147,167,561
Treasury stock, shares	43,376,292	43,207,240

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenues:
Oil and natural gas		$ 4,284	$ 6,027	$ 12,973	$ 20,343
Total operating revenues		206,133	422,251	668,979	1,552,711
Operating costs and expenses:
Contract drilling		74,517	136,718	219,218	503,376
Pressure pumping		77,221	138,597	234,580	494,078
Oil and natural gas		1,846	2,519	5,586	8,096
Depreciation, depletion, amortization and impairment		163,464	332,151	511,209	689,457
Impairment of goodwill			124,561		124,561
Selling, general and administrative		16,612	18,582	51,671	58,335
Other operating (income) expense, net	[1]	(4,118)	(1,362)	(10,285)	4,984
Total operating costs and expenses		329,542	751,766	1,011,979	1,882,887
Operating loss		(123,409)	(329,515)	(343,000)	(330,176)
Other income (expense):
Interest income		63	323	273	924
Interest expense, net of amount capitalized		(10,244)	(9,254)	(31,722)	(27,044)
Other		19	16	52	16
Total other expense		(10,162)	(8,915)	(31,397)	(26,104)
Loss before income taxes		(133,571)	(338,430)	(374,397)	(356,280)
Income tax benefit		(49,428)	(112,452)	(133,885)	(120,452)
Net loss		$ (84,143)	$ (225,978)	$ (240,512)	$ (235,828)
Net loss per common share:
Basic		$ (0.58)	$ (1.54)	$ (1.65)	$ (1.61)
Diluted		$ (0.58)	$ (1.54)	$ (1.65)	$ (1.61)
Weighted average number of common shares outstanding:
Basic		146,326	145,662	146,014	145,317
Diluted		146,326	145,662	146,014	145,317
Cash dividends per common share		$ 0.02	$ 0.10	$ 0.14	$ 0.30
Contract Drilling
Operating revenues:
Oil and gas services		$ 123,684	$ 261,817	$ 407,578	$ 951,616
Pressure Pumping
Operating revenues:
Oil and gas services		$ 78,165	154,407	$ 248,428	$ 580,752
Operating costs and expenses:
Impairment of goodwill			$ 125,000
[1]	Other operating income (expense) includes net gains or losses associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been excluded from the operating results of specific segments. This caption also includes expenses related to certain legal settlements net of insurance reimbursements.

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (84,143)	$ (225,978)	$ (240,512)	$ (235,828)
Other comprehensive income (loss), net of taxes of $0 for all periods:
Foreign currency translation adjustment	(2,379)	(2,909)	4,768	(8,454)
Total comprehensive loss	$ (86,522)	$ (228,887)	$ (235,744)	$ (244,282)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Other comprehensive income (loss), taxes	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2015	$ 2,561,131	$ 1,904	$ 1,011,811	$ 2,458,554	$ (4,093)	$ (907,045)
Beginning Balance (in shares) at Dec. 31, 2015	190,374,801	190,375,000
Net loss	$ (240,512)			(240,512)
Foreign currency translation adjustment	4,768				4,768
Shares issued for acquisition	6,733	$ 3	6,730
Shares issued for acquisition (in shares)		354,000
Issuance of restricted stock		$ 8	(8)
Issuance of restricted stock (in shares)		785,000
Vesting of restricted stock units (in shares)		15,000
Forfeitures of restricted stock (in shares)		(34,000)
Stock-based compensation	21,130		21,130
Tax expense related to stock- based compensation	(4,895)		(4,895)
Payment of cash dividends	(20,618)			(20,618)
Purchase of treasury stock	(3,611)					(3,611)
Ending Balance at Sep. 30, 2016	$ 2,324,126	$ 1,915	$ 1,034,768	$ 2,197,424	$ 675	$ (910,656)
Ending Balance (in shares) at Sep. 30, 2016	191,494,741	191,495,000

CONDENSED CONSOLIDATED STATEME8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (240,512)	$ (235,828)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment	511,209	689,457
Impairment of goodwill		124,561
Dry holes and abandonments		159
Deferred income tax benefit	(109,045)	(110,231)
Stock-based compensation expense	21,130	21,186
Net gain on asset disposals	(9,808)	(7,276)
Tax expense on stock-based compensation	(4,895)
Amortization of debt issuance costs	2,184	884
Changes in operating assets and liabilities:
Accounts receivable	74,742	359,304
Income taxes receivable	28,524	52,037
Inventory and other assets	7,876	26,695
Accounts payable	(19,652)	(120,740)
Accrued expenses	(7,616)	7,274
Other liabilities	(1,431)	(1,443)
Net cash provided by operating activities	252,706	806,039
Cash flows from investing activities:
Purchases of property and equipment	(80,511)	(608,220)
Proceeds from disposal of assets	18,384	15,920
Cash acquired in acquisition	155
Net cash used in investing activities	(61,972)	(592,300)
Cash flows from financing activities:
Purchases of treasury stock	(3,611)	(8,010)
Dividends paid	(20,618)	(44,064)
Tax benefit related to stock-based compensation		458
Debt issuance costs	(3,357)	(1,979)
Proceeds from long-term debt		200,000
Repayment of long-term debt	(255,000)	(17,500)
Proceeds from borrowings under revolving credit facility	95,000	54,000
Repayment of borrowings under revolving credit facility	(80,000)	(357,000)
Net cash used in financing activities	(267,586)	(174,095)
Effect of foreign exchange rate changes on cash	478	(6,191)
Net increase (decrease) in cash and cash equivalents	(76,374)	33,453
Cash and cash equivalents at beginning of period	113,346	43,012
Cash and cash equivalents at end of period	36,972	76,465
Net cash (paid) received during the period for:
Interest, net of capitalized interest of $327 in 2016 and $4,946 in 2015	(21,973)	(18,734)
Income taxes	44,987	63,785
Non-cash investing and financing activities:
Net increase (decrease) in payables for purchases of property and equipment	16,884	(95,371)
Issuance of common stock for business acquisition	6,733
Net decrease in deposits on equipment purchases	$ 4,667	$ 76,516

CONDENSED CONSOLIDATED STATEME9

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement Of Cash Flows [Abstract]
Interest expense, capitalized interest	$ 327	$ 4,946

Basis of Consolidation and Pres

Basis of Consolidation and Presentation	9 Months Ended
	Sep. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Consolidation and Presentation	1. Basis of Consolidation and Presentation The unaudited interim condensed consolidated financial statements include the accounts of Patterson-UTI Energy, Inc. (the “Company”) and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Except for wholly-owned subsidiaries, the Company has no controlling financial interests in any entity which would require consolidation. The unaudited interim condensed consolidated financial statements have been prepared by management of the Company pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been omitted pursuant to such rules and regulations, although the Company believes the disclosures included either on the face of the financial statements or herein are sufficient to make the information presented not misleading. In the opinion of management, all recurring adjustments considered necessary for a fair statement of the information in conformity with accounting principles generally accepted in the United States of America have been included. The Unaudited Condensed Consolidated Balance Sheet as of December 31, 2015, as presented herein, was derived from the audited consolidated balance sheet of the Company, but does not include all disclosures required by accounting principles generally accepted in the United States of America. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015. The results of operations for the nine months ended September 30, 2016 are not necessarily indicative of the results to be expected for the full year. The U.S. dollar is the functional currency for all of the Company’s operations except for its Canadian operations, which uses the Canadian dollar as its functional currency. The effects of exchange rate changes are reflected in accumulated other comprehensive income, which is a separate component of stockholders’ equity. During the first quarter of 2016, the Company determined that certain income and expense items should be classified as “other operating (income) expense, net” in the condensed consolidated statements of operations. This caption now includes gains and losses on asset disposals and expenses related to certain legal settlements. Gains and losses on asset disposals were previously presented as a separate line in the condensed consolidated statements of operations. Expenses related to certain legal settlements were previously included in operating costs of the respective operating segment or within selling, general and administrative expense. For comparative purposes, all such prior period amounts were reclassified to conform to the current presentation, including the Company’s previously disclosed $12.3 million legal settlement that was previously included within selling, general and administrative expense for the nine months ended September 30, 2015. The Company provides a dual presentation of its net income (loss) per common share in its unaudited condensed consolidated statements of operations: Basic net income (loss) per common share (“Basic EPS”) and diluted net income (loss) per common share (“Diluted EPS”). Basic EPS excludes dilution and is computed by first allocating earnings between common stockholders and holders of non-vested shares of restricted stock. Basic EPS is then determined by dividing the earnings attributable to common stockholders by the weighted average number of common shares outstanding during the period, excluding non-vested shares of restricted stock. Diluted EPS is based on the weighted average number of common shares outstanding plus the dilutive effect of potential common shares, including stock options, non-vested shares of restricted stock and restricted stock units. The dilutive effect of stock options and restricted stock units is determined using the treasury stock method. The dilutive effect of non-vested shares of restricted stock is based on the more dilutive of the treasury stock method or the two-class method, assuming a reallocation of undistributed earnings to common stockholders after considering the dilutive effect of potential common shares other than non-vested shares of restricted stock. The following table presents information necessary to calculate net loss per share for the three and nine month periods ended September 30, 2016 and 2015 as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 BASIC EPS: Net loss $ (84,143 ) $ (225,978 ) $ (240,512 ) $ (235,828 ) Adjust for loss attributed to holders of non-vested restricted stock — 2,359 — 2,436 Loss attributed to other common stockholders $ (84,143 ) $ (223,619 ) $ (240,512 ) $ (233,392 ) Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317 Basic net loss per common share $ (0.58 ) $ (1.54 ) $ (1.65 ) $ (1.61 ) DILUTED EPS: Loss attributed to other common stockholders $ (84,143 ) $ (223,619 ) $ (240,512 ) $ (233,392 ) Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317 Add dilutive effect of potential common shares — — — — Weighted average number of diluted common shares outstanding 146,326 145,662 146,014 145,317 Diluted net loss per common share $ (0.58 ) $ (1.54 ) $ (1.65 ) $ (1.61 ) Potentially dilutive securities excluded as anti-dilutive 9,141 7,840 9,141 7,840

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based Compensation	2. Stock-based Compensation The Company uses share-based payments to compensate employees and non-employee directors. The Company recognizes the cost of share-based payments under the fair-value-based method. Share-based awards consist of equity instruments in the form of stock options, restricted stock or restricted stock units that have included service conditions and, in certain cases, performance conditions. The Company’s share-based awards also included share-settled performance unit awards. Share-settled performance unit awards are accounted for as equity awards. The Company issues shares of common stock when vested stock options are exercised, when restricted stock is granted and when restricted stock units and share-settled performance unit awards vest. Stock Options — The Company estimates the grant date fair values of stock options using the Black-Scholes-Merton valuation model. Volatility assumptions are based on the historic volatility of the Company’s common stock over the most recent period equal to the expected term of the options as of the date such options are granted. The expected term assumptions are based on the Company’s experience with respect to employee stock option activity. Dividend yield assumptions are based on the expected dividends at the time the options are granted. The risk-free interest rate assumptions are determined by reference to United States Treasury yields. Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three and nine month periods ended September 30, 2016 and 2015 follow: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Volatility 34.87 % NA 35.11 % 37.95 % Expected term (in years) 5.00 NA 5.00 5.00 Dividend yield 0.42 % NA 2.05 % 2.00 % Risk-free interest rate 1.20 % NA 1.40 % 1.37 % Stock option activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Underlying Exercise Price Shares Per Share Outstanding at January 1, 2016 6,307,250 $ 21.68 Granted 969,900 $ 18.40 Exercised — $ — Cancelled — $ — Expired (550,000 ) $ 28.26 Outstanding at September 30, 2016 6,727,150 $ 20.67 Exercisable at September 30, 2016 5,266,379 $ 20.91 Restricted Stock — For all restricted stock awards made to date, shares of common stock were issued when the awards were made. Non-vested shares are subject to forfeiture for failure to fulfill service conditions and, in certain cases, performance conditions. Non-forfeitable dividends are paid on non-vested shares of restricted stock. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period. Restricted stock activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Grant Date Fair Value Shares Per Share Non-vested restricted stock outstanding at January 1, 2016 1,432,250 $ 24.56 Granted 785,486 $ 20.58 Vested (709,008 ) $ 24.66 Forfeited (34,383 ) $ 24.89 Non-vested restricted stock outstanding September 30, 2016 1,474,345 $ 22.38 Restricted Stock Units — For all restricted stock unit awards made to date, shares of common stock are not issued until the units vest. Restricted stock units are subject to forfeiture for failure to fulfill service conditions. Non-forfeitable cash dividend equivalents are paid on certain non-vested restricted stock units. The Company uses the straight-line method to recognize periodic compensation cost over the vesting period. Restricted stock unit activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Grant Date Fair Value Shares Per Share Non-vested restricted stock units outstanding at January 1, 2016 41,686 $ 26.22 Granted 178,254 $ 19.31 Vested (15,033 ) $ 27.30 Forfeited (7,668 ) $ 24.83 Non-vested restricted stock units outstanding September 30, 2016 197,239 $ 19.94 Performance Unit Awards. The Company has granted stock-settled performance unit awards to certain executive officers (the “Performance Units”) on an annual basis since 2010. The Performance Units provide for the recipients to receive a grant of shares of stock upon the achievement of certain performance goals during a specified period established by the Compensation Committee. The performance period for the Performance Units is the three year period commencing on April 1 of the year of grant, except that for the Performance Units granted in 2013 the performance period was extended pursuant to its terms, as described below. The performance goals for the Performance Units are tied to the Company’s total shareholder return for the performance period as compared to total shareholder return for a peer group determined by the Compensation Committee. These goals are considered to be market conditions under the relevant accounting standards and the market conditions were factored into the determination of the fair value of the respective performance units. Generally, the recipients will receive a target number of shares if the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 50 th th th th th th For the Performance Units granted in April 2016, if the Company’s total shareholder return is negative, and, when compared to the peer group is at or above the 25th percentile, then the recipients will receive one-half of the number of shares they would have received had the Company’s total shareholder return been positive. In respect of the 2013 Performance Units, for which the performance period ended March 31, 2016, the Company’s total shareholder return for the performance period was negative, the Company’s total shareholder return for the performance period when compared to the peer group was above the 75 th The total target number of shares with respect to the Performance Units for the awards in 2012-2016 is set forth below: 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Target number of shares 185,000 190,600 154,000 236,500 192,000 Because the performance units are stock-settled awards, they are accounted for as equity awards and measured at fair value on the date of grant using a Monte Carlo simulation model. The fair value of the Performance Units is set forth below (in thousands): 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Fair value at date of grant $ 3,854 $ 4,052 $ 5,388 $ 5,564 $ 3,065 These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Performance Units is shown below (in thousands): 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Three months ended September 30, 2015 NA $ 338 $ 449 $ 464 NA Three months ended September 30, 2016 $ 321 $ 338 $ 449 NA NA Nine months ended September 30, 2015 NA $ 675 $ 1,347 $ 1,391 $ 255 Nine months ended September 30, 2016 $ 642 $ 1,013 $ 1,347 $ 464 NA

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2016
Property Plant And Equipment [Abstract]
Property and Equipment	3. Property and Equipment Property and equipment consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Equipment $ 6,808,201 $ 6,963,148 Oil and natural gas properties 201,450 200,923 Buildings 96,950 96,470 Land 22,370 22,370 7,128,971 7,282,911 Less accumulated depreciation, depletion and impairment (3,617,231 ) (3,362,203 ) Property and equipment, net $ 3,511,740 $ 3,920,708 The Company evaluates the recoverability of its long-lived assets whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable (a “triggering event”). Based on recent commodity prices, the Company’s results of operations for the three and nine month periods ended September 30, 2016 and management’s expectations of operating results in future periods, the Company concluded that no triggering event occurred during the nine months ended September 30, 2016 with respect to its contract drilling or pressure pumping segments. Management’s expectations of future operating results were based on the assumption that activity levels in both segments will begin to recover by early 2017 in response to improved future oil prices. Depreciation, amortization and impairment expense for the three and nine month periods ended September 30, 2015, included a charge of $131 million related to the write-down of drilling equipment, primarily related to mechanical drilling rigs and spare mechanical rig components, to their realizable values and $22.0 million related to the write-down of pressure pumping equipment and certain closed facilities to their realizable values. The Company reviews its proved oil and natural gas properties for impairment whenever a triggering event occurs, such as downward revisions in reserve estimates or decreases in expected future oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are prepared based on the Company’s expectation of future pricing over the lives of the respective fields. These cash flow estimates are reviewed by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between net book value and fair value. The fair value estimates used in measuring impairment are based on internally developed unobservable inputs including reserve volumes and future production, pricing and operating costs (Level 3 inputs in the fair value hierarchy of fair value accounting). The expected future net cash flows are discounted using an annual rate of 10% to determine fair value. The Company reviews unproved oil and natural gas properties quarterly to assess potential impairment. The Company’s impairment assessment is made on a lease-by-lease basis and considers factors such as the Company’s intent to drill, lease terms and abandonment of an area. If an unproved property is determined to be impaired, the related property costs are expensed. Impairment expense related to proved and unproved oil and natural gas properties totaled $205,000 in the third quarter and approximately $2.4 million for the nine months ended September 30, 2016 and is included in depreciation, depletion, amortization and impairment in the condensed consolidated statements of operations.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Business Segments	4. Business Segments The Company’s revenues, operating income (losses) and identifiable assets are primarily attributable to three business segments: (i) contract drilling of oil and natural gas wells, (ii) pressure pumping services and (iii) the investment, on a non-operating working interest basis, in oil and natural gas properties. Each of these segments represents a distinct type of business and has a separate management team that reports to the Company’s chief operating decision maker. The results of operations in these segments are regularly reviewed by the chief operating decision maker for purposes of determining resource allocation and assessing performance. The following tables summarize selected financial information relating to the Company’s business segments (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Revenues: Contract drilling $ 123,863 $ 262,196 $ 407,855 $ 953,025 Pressure pumping 78,165 154,407 248,428 580,752 Oil and natural gas 4,284 6,027 12,973 20,343 Total segment revenues 206,312 422,630 669,256 1,554,120 Elimination of intercompany revenues (a) (179 ) (379 ) (277 ) (1,409 ) Total revenues $ 206,133 $ 422,251 $ 668,979 $ 1,552,711 Operating income (loss): Contract drilling $ (67,786 ) $ (131,256 ) $ (173,331 ) $ (53,432 ) Pressure pumping (46,569 ) (183,464 ) (136,553 ) (217,224 ) Oil and natural gas 582 (1,824 ) (1,006 ) (10,017 ) (113,773 ) (316,544 ) (310,890 ) (280,673 ) Corporate and other (13,754 ) (14,333 ) (42,395 ) (44,519 ) Other operating income (expense), net (b) 4,118 1,362 10,285 (4,984 ) Interest income 63 323 273 924 Interest expense (10,244 ) (9,254 ) (31,722 ) (27,044 ) Other 19 16 52 16 Loss before income taxes $ (133,571 ) $ (338,430 ) $ (374,397 ) $ (356,280 ) September 30, December 31, 2016 2015 Identifiable assets: Contract drilling $ 3,113,229 $ 3,457,044 Pressure pumping 677,100 813,704 Oil and natural gas 31,347 34,073 Corporate and other (c) 87,197 224,663 Total assets $ 3,908,873 $ 4,529,484 (a) Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment. (b) Other operating income (expense) includes net gains or losses associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been excluded from the operating results of specific segments. This caption also includes expenses related to certain legal settlements net of insurance reimbursements. (c) Corporate and other assets primarily include cash on hand, income tax receivables, certain deferred tax assets and the assets of a business acquired in September 2016 that designs, manufactures, repairs and services pipe handling equipment and other rig components, including top drives and tubular tongs.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	5. Goodwill and Intangible Assets Goodwill — All of the Company’s goodwill at both September 30, 2016 and December 31, 2015 related to the contract drilling operating segment. Goodwill as of September 30, 2016 and changes for the nine months then ended are as follows (in thousands): Nine Months Ended September 30, 2016 Balance at beginning of period $ 86,234 Changes to goodwill — Balance at end of period $ 86,234 There were no accumulated impairment losses related to goodwill as of September 30, 2016 or December 31, 2015. Goodwill is evaluated at least annually as of December 31, or when circumstances require, to determine if the fair value of recorded goodwill has decreased below its carrying value. For impairment testing purposes, goodwill is evaluated at the reporting unit level. The Company’s reporting units for impairment testing are its operating segments. The Company first determines whether it is more likely than not that the fair value of a reporting unit is less than its carrying value after considering qualitative, market and other factors, and if this is the case, any necessary goodwill impairment is determined using a two-step quantitative impairment test. From time to time, the Company may perform the first step of the quantitative testing for goodwill impairment in lieu of performing the qualitative assessment. The first step of the quantitative testing is to compare the fair value of an entity’s reporting units to the respective carrying value of those reporting units. If the carrying value of a reporting unit exceeds its fair value, the second step of the quantitative testing is performed whereby the fair value of the reporting unit is allocated to its identifiable tangible assets, intangible assets and liabilities with any remaining fair value representing the fair value of goodwill. If this resulting fair value of goodwill is less than the carrying value of goodwill, an impairment loss would be recognized for the amount of the shortfall. Based on the results of the first step of the goodwill impairment test as of September 30, 2015, management concluded that impairment was indicated in its pressure pumping reporting unit and the Company recognized an impairment charge of $125 million in the three months ended September 30, 2015. The implied fair value of goodwill was estimated using a variety of valuation methods, including the income and market approaches. The estimate of fair value required the use of significant unobservable inputs, representative of a Level 3 fair value measurement. The inputs included assumptions related to the future performance of the Company’s pressure pumping reporting unit, such as future oil and natural gas prices and projected demand for the Company’s services, and assumptions related to discount rates, long-term growth rates and control premiums. Intangible Assets — Intangible assets were recorded in the pressure pumping operating segment in connection with the fourth quarter 2010 acquisition of the assets of a pressure pumping business. As a result of the purchase price allocation, the Company recorded an intangible asset related to the customer relationships acquired. The intangible asset was recorded at fair value on the date of acquisition. The value of the customer relationships was estimated using a multi-period excess earnings model to determine the present value of the projected cash flows associated with the customers in place at the time of the acquisition and taking into account a contributory asset charge. The resulting intangible asset is being amortized on a straight-line basis over seven years. Amortization expense of approximately $911,000 was recorded in the three months ended September 30, 2016 and 2015, and amortization expense of approximately $2.7 million was recorded in the nine months ended September 30, 2016 and 2015. The following table presents the gross carrying amount and accumulated amortization of the customer relationships as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Gross Net Gross Net Carrying Accumulated Carrying Carrying Accumulated Carrying Amount Amortization Amount Amount Amortization Amount Customer relationships $ 25,500 $ (21,857 ) $ 3,643 $ 25,500 $ (19,125 ) $ 6,375

Accrued Expenses

Accrued Expenses	9 Months Ended
	Sep. 30, 2016
Payables And Accruals [Abstract]
Accrued Expenses	6. Accrued Expenses Accrued expenses consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Salaries, wages, payroll taxes and benefits $ 23,259 $ 27,055 Workers' compensation liability 70,073 75,358 Property, sales, use and other taxes 11,082 9,061 Insurance, other than workers' compensation 9,392 12,817 Accrued interest payable 13,925 7,668 Other 26,497 29,652 Total $ 154,228 $ 161,611

Asset Retirement Obligation

Asset Retirement Obligation	9 Months Ended
	Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	7. Asset Retirement Obligation The Company records a liability for the estimated costs to be incurred in connection with the abandonment of oil and natural gas properties in the future. This liability is included in the caption “other” in the liabilities section of the condensed consolidated balance sheet. The following table describes the changes to the Company’s asset retirement obligations during the nine months ended September 30, 2016 and 2015 (in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of year $ 5,692 $ 5,301 Liabilities incurred 84 322 Liabilities settled (74 ) (118 ) Accretion expense 126 129 Revision in estimated costs of plugging oil and natural gas wells 42 — Asset retirement obligation at end of period $ 5,870 $ 5,634

Long Term Debt

Long Term Debt	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Long Term Debt	8. Long Term Debt 2012 Credit Agreement — On September 27, 2012, the Company entered into a Credit Agreement (“Base Credit Agreement”) with Wells Fargo Bank, N.A., as administrative agent, letter of credit issuer, swing line lender and lender, and each of the other lenders party thereto. The Base Credit Agreement (as amended, the “Credit Agreement”) is a committed senior unsecured credit facility that includes a revolving credit facility. On July 8, 2016, the Company entered into Amendment No. 2 to the Credit Agreement (“Amendment No. 2”), which amended the Base Credit Agreement. The revolving credit facility permits aggregate borrowings of up to $500 million outstanding at any time, subject to a borrowing base calculated by reference to the Company’s and certain of its subsidiaries’ eligible equipment, inventory, account receivable and unencumbered cash as described in Amendment No. 2. The revolving credit facility contains a letter of credit facility that is limited to $50 million and a swing line facility that is limited to $20 million, in each case outstanding at any time. Subject to customary conditions, the Company may request that the lenders’ aggregate commitments with respect to the revolving credit facility be increased by up to $100 million, not to exceed total commitments of $600 million. The maturity date under the Base Credit Agreement was September 27, 2017 for the revolving facility; however, Amendment No. 2 extended the maturity date of $357.9 million in revolving credit commitments of certain lenders to March 27, 2019. The term loan facility included in the Base Credit Agreement, which facility was terminated in connection with Amendment No. 2, provided for a loan of $100 million, which was drawn on December 24, 2012 and was payable in quarterly principal installments. As a condition precedent, Amendment No. 2 required that the Company repay the entire outstanding principal amount of this term loan. Loans under the Credit Agreement bear interest by reference, at the Company’s election, to the LIBOR rate or base rate, provided, that swing line loans bear interest by reference only to the base rate. Until September 27, 2017, the applicable margin on LIBOR rate loans varies from 2.75% to 3.25% and the applicable margin on base rate loans varies from 1.75% to 2.25%, in each case determined based upon the Company’s debt to capitalization ratio. Beginning September 27, 2017, the applicable margin on LIBOR rate loans varies from 3.25% to 3.75% and the applicable margin on base rate loans varies from 2.25% to 2.75%, in each case determined based on the Company’s excess availability under the credit facility. As of September 30, 2016 the applicable margin on LIBOR rate loans was 2.75% and the applicable margin on base rate loans was 1.75%. Based on the Company’s debt to capitalization ratio at June 30, 2016, the applicable margin on LIBOR loans is 2.75% and the applicable margin on base rate loans is 1.75% as of October 1, 2016. Based on the Company’s debt to capitalization ratio at September 30, 2016, the applicable margin on LIBOR loans will be 2.75% and the applicable margin on base rate loans will be 1.75% as of January 1, 2017. A letter of credit fee is payable by the Company equal to the applicable margin for LIBOR rate loans times the daily amount available to be drawn under outstanding letters of credit. The commitment fee rate payable to the lenders for the unused portion of the credit facility is 0.50%. Each domestic subsidiary of the Company unconditionally guarantees all existing and future indebtedness and liabilities of the other guarantors and the Company arising under the Credit Agreement, other than (a) Ambar Lone Star Fluid Services LLC, (b) domestic subsidiaries that directly or indirectly have no material assets other than equity interests in, or capitalization indebtedness owed by, foreign subsidiaries, and (c) any subsidiary having total assets of less than $1 million. Such guarantees also cover obligations of the Company and any subsidiary of the Company arising under any interest rate swap contract with any person while such person is a lender or an affiliate of a lender under the Credit Agreement. The Credit Agreement requires compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 40%. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2016. Amendment No. 2 limits the Company’s ability to make investments in foreign subsidiaries or joint ventures such that, if the book value of all such investments since September 27, 2012 is above 20% of the total book value of the assets of the Company and its subsidiaries on a pro forma basis, the Company will not be able to make such investment. Amendment No. 2 also restricts the Company’s ability to pay dividends and make equity repurchases, subject to certain exceptions, including an exception allowing such restricted payments if before and immediately after giving effect to such restricted payment, the Pro Forma Debt Service Coverage Ratio (as defined in Amendment No. 2) is at least 1.50 to 1.00. In addition, Amendment No. 2 requires that, if the consolidated cash balance of the Company and its subsidiaries, subject to certain exclusions, is more than $100 million at the end of the day on which a borrowing is made, the Company can only use the proceeds from such borrowing to fund acquisitions, capital expenditures and the repurchase of indebtedness, and if such proceeds are not used in such manner within three business days, the Company must repay such unused proceeds on the fourth business day following such borrowings. Amendment No. 2 also decreased the permitted amount of certain secured indebtedness of the Company and its subsidiaries and decreased the permitted amount of certain unsecured indebtedness of the Company’s subsidiaries. The Credit Agreement also contains customary representations, warranties and affirmative and negative covenants. Events of default under the Credit Agreement include failure to pay principal or interest when due, failure to comply with the financial and operational covenants, as well as a cross default event, loan document enforceability event, change of control event and bankruptcy and other insolvency events. If an event of default occurs and is continuing, then a majority of the lenders have the right, among others, to (i) terminate the commitments under the Credit Agreement, (ii) accelerate and require the Company to repay all the outstanding amounts owed under any loan document (provided that in limited circumstances with respect to insolvency and bankruptcy of the Company, such acceleration is automatic), and (iii) require the Company to cash collateralize any outstanding letters of credit. As of September 30, 2016, the Company had $15.0 million drawn under the revolving credit facility at a weighted average interest rate of 4.0%, with available borrowing capacity of $317 million. 2015 Reimbursement Agreement — On March 16, 2015, the Company entered into a Reimbursement Agreement (the “Reimbursement Agreement”) with The Bank of Nova Scotia (“Scotiabank”), pursuant to which the Company may from time to time request that Scotiabank issue an unspecified amount of letters of credit. As of September 30, 2016, the Company had $38.2 million in letters of credit outstanding under the Reimbursement Agreement. Under the terms of the Reimbursement Agreement, the Company will reimburse Scotiabank on demand for any amounts that Scotiabank has disbursed under any letters of credit. Fees, charges and other reasonable expenses for the issuance of letters of credit are payable by the Company at the time of issuance at such rates and amounts as are in accordance with Scotiabank’s prevailing practice. The Company is obligated to pay to Scotiabank interest on all amounts not paid by the Company on the date of demand or when otherwise due at the LIBOR rate plus 2.25% per annum, calculated daily and payable monthly, in arrears, on the basis of a calendar year for the actual number of days elapsed, with interest on overdue interest at the same rate as on the reimbursement amounts. The Company has also agreed that if obligations under the Credit Agreement are secured by liens on any of its or any of its subsidiaries’ property, then the Company’s reimbursement obligations and (to the extent similar obligations would be secured under the Credit Agreement) other obligations under the Reimbursement Agreement and any letters of credit will be equally and ratably secured by all property subject to such liens securing the Credit Agreement. Pursuant to a Continuing Guaranty dated as of March 16, 2015, the Company’s payment obligations under the Reimbursement Agreement are jointly and severally guaranteed as to payment and not as to collection by subsidiaries of the Company that from time to time guarantee payment under the Credit Agreement. 2015 Term Loan Agreement — On March 18, 2015, the Company entered into a Term Loan Agreement (the “2015 Term Loan Agreement”) with Wells Fargo Bank, N.A., as administrative agent and lender, each of the other lenders party thereto, Wells Fargo Securities, LLC, as Lead Arranger and Sole Book Runner, and Bank of America, N.A. and The Bank Of Tokyo-Mitsubishi UFJ, LTD., as Co-Syndication Agents. The 2015 Term Loan Agreement was a senior unsecured single-advance term loan facility pursuant to which the Company made a term loan borrowing of $200 million on March 18, 2015 (the “Term Loan Borrowing”). The Term Loan Borrowing was payable in quarterly principal installments, together with accrued interest. Loans under the 2015 Term Loan Agreement bore interest, at the Company’s election, at the per annum rate of LIBOR rate plus 3.25% or base rate plus 2.25%. As a condition precedent to Amendment No 2, the Company repaid the entire outstanding principal amount under the 2015 Term Loan Agreement and terminated the agreement on July 8, 2016. Senior Notes — On October 5, 2010, the Company completed the issuance and sale of $300 million in aggregate principal amount of its 4.97% Series A Senior Notes due October 5, 2020 (the “Series A Notes”) in a private placement. The Series A Notes bear interest at a rate of 4.97% per annum. The Company pays interest on the Series A Notes on April 5 and October 5 of each year. The Series A Notes will mature on October 5, 2020. On June 14, 2012, the Company completed the issuance and sale of $300 million in aggregate principal amount of its 4.27% Series B Senior Notes due June 14, 2022 (the “Series B Notes”) in a private placement. The Series B Notes bear interest at a rate of 4.27% per annum. The Company pays interest on the Series B Notes on April 5 and October 5 of each year. The Series B Notes will mature on June 14, 2022. The Series A Notes and Series B Notes are senior unsecured obligations of the Company which rank equally in right of payment with all other unsubordinated indebtedness of the Company. The Series A Notes and Series B Notes are guaranteed on a senior unsecured basis by each of the existing domestic subsidiaries of the Company other than subsidiaries that are not required to be guarantors under the Credit Agreement. The Series A Notes and Series B Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date. The respective note purchase agreements require compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2016. Events of default under the note purchase agreements include failure to pay principal or interest when due, failure to comply with the financial and operational covenants, a cross default event, a judgment in excess of a threshold event, the guaranty agreement ceasing to be enforceable, the occurrence of certain ERISA events, a change of control event and bankruptcy and other insolvency events. If an event of default under the note purchase agreements occurs and is continuing, then holders of a majority in principal amount of the respective notes have the right to declare all the notes then-outstanding to be immediately due and payable. In addition, if the Company defaults in payments on any note, then until such defaults are cured, the holder thereof may declare all the notes held by it pursuant to the note purchase agreement to be immediately due and payable. In April and August 2015, the Financial Accounting Standards Board (“FASB”) issued accounting standards updates to provide guidance for the presentation of debt issuance costs. Under this guidance, debt issuance costs, except those related to line-of-credit arrangements, are presented in the balance sheet as a direct deduction from the carrying amount of the related debt. Debt issuance costs related to line-of-credit arrangements can continue to be classified as a deferred charge. Amortization of debt issuance costs continues to be reported as interest expense. This guidance became effective for the Company during the three months ended March 31, 2016. This guidance was applied retrospectively, and debt issuance costs and long-term debt as of December 31, 2015 have been adjusted. There was no impact on results of operations or cash flows as a result of the adoption of this guidance. Interest expense related to the amortization of debt issuance costs was approximately $2.0 million and $746,000 for the three months ended September 30, 2016 and 2015, respectively. Interest expense related to the amortization of debt issuance costs was approximately $3.5 million and $2.0 million for the nine months ended September 30, 2016 and 2015, respectively. Debt issuance costs amortization for the three and nine months ended September 30, 2016 includes $1.4 million of costs related to the early termination of the 2012 and 2015 term loan agreements. Presented below is a schedule of the principal repayment requirements of long-term debt as of September 30, 2016 (in thousands): Year ending December 31, 2016 $ — 2017 — 2018 — 2019 15,000 2020 300,000 Thereafter 300,000 Total $ 615,000

Commitments, Contingencies and

Commitments, Contingencies and Other Matters	9 Months Ended
	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments, Contingencies and Other Matters	9. Commitments, Contingencies and Other Matters As of September 30, 2016, the Company maintained letters of credit in the aggregate amount of $38.2 million for the benefit of various insurance companies as collateral for retained losses which could become payable under the terms of the underlying insurance contracts. These letters of credit expire annually at various times during the year and are typically renewed. As of September 30, 2016, no amounts had been drawn under the letters of credit. As of September 30, 2016, the Company had commitments to purchase approximately $64.2 million of major equipment for its drilling and pressure pumping businesses. The Company’s pressure pumping business has entered into agreements to purchase minimum quantities of proppants and chemicals from certain vendors. These agreements expire in 2017 and 2018. As of September 30, 2016, the remaining obligation under these agreements was approximately $22.0 million, of which approximately $5.0 million relates to purchases required during the remainder of 2016. In the event the required minimum quantities are not purchased during any contract year, the Company could be required to make a liquidated damages payment to the respective vendor for any shortfall. In November 2011, the Company’s pressure pumping business entered into an agreement with a proppant vendor to advance up to $12.0 million to such vendor to finance the construction of certain processing facilities. This advance is secured by the underlying processing facilities. Repayment of the advance is to be made through discounts applied to purchases from the vendor. As of September 30, 2016, advances of approximately $11.8 million had been made under this agreement and principal repayments of approximately $10.6 million had been received, resulting in a balance outstanding of approximately $1.2 million. The Company is party to various legal proceedings arising in the normal course of its business. The Company does not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition, results of operations or cash flows.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Stockholders' Equity	10. Stockholders’ Equity Cash Dividends — The Company paid cash dividends during the nine months ended September 30, 2015 and 2016 as follows: 2015: Per Share Total (in thousands) Paid on March 25, 2015 $ 0.10 $ 14,640 Paid on June 24, 2015 0.10 14,712 Paid on September 24, 2015 0.10 14,712 Total cash dividends $ 0.30 $ 44,064 2016: Per Share Total (in thousands) Paid on March 24, 2016 $ 0.10 $ 14,712 Paid on June 23, 2016 0.02 2,953 Paid on September 22, 2016 0.02 2,953 Total cash dividends $ 0.14 $ 20,618 On October 26, 2016, the Company’s Board of Directors approved a cash dividend on its common stock in the amount of $0.02 per share to be paid on December 22, 2016 to holders of record as of December 8, 2016. The amount and timing of all future dividend payments, if any, are subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of the Company’s debt agreements and other factors. On September 6, 2013, the Company’s Board of Directors approved a stock buyback program that authorizes purchase of up to $200 million of the Company’s common stock in open market or privately negotiated transactions. As of September 30, 2016, the Company had remaining authorization to purchase approximately $187 million of the Company’s outstanding common stock under the stock buyback program. Shares purchased under a buyback program are accounted for as treasury stock. On September 15, 2016, the Company issued 353,804 shares of its common stock, valued at $6.7 million in connection with an acquisition. The transaction was not significant to the Company’s consolidated financial statements. Treasury stock acquisitions during the nine months ended September 30, 2016 were as follows (dollars in thousands): September 30, 2016 Shares Cost Treasury shares at beginning of period 43,207,240 $ 907,045 Purchases pursuant to stock buyback program 8,488 183 Acquisitions pursuant to long-term incentive plan 160,564 3,428 Treasury shares at end of period 43,376,292 $ 910,656

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes The Company’s effective income tax rate was 35.8% for the nine months ended September 30, 2016, compared to 33.8% for the nine months ended September 30, 2015. The difference in the effective tax rate is primarily related to the impact of goodwill impairment charges in 2015 and adjustment to the deferred tax liability associated with the conversion of the Company’s Canadian operations to a controlled foreign corporation established in 2010.

Fair Values of Financial Instru

Fair Values of Financial Instruments	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Values of Financial Instruments	12. Fair Values of Financial Instruments The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items. These fair value estimates are considered Level 1 fair value estimates in the fair value hierarchy of fair value accounting. The estimated fair value of the Company’s outstanding debt balances (including current portion) as of September 30, 2016 and December 31, 2015 is set forth below (in thousands): September 30, 2016 December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Borrowings under Credit Agreement: Revolving credit facility $ 15,000 $ 15,000 $ — $ — Term loan facility — — 70,000 70,000 2015 Term Loan — — 185,000 185,000 4.97% Series A Senior Notes 300,000 288,203 300,000 279,635 4.27% Series B Senior Notes 300,000 270,849 300,000 258,806 Total debt $ 615,000 $ 574,052 $ 855,000 $ 793,441 The carrying values of the balances outstanding under the Credit Agreement and the 2015 Term Loan Agreement approximate their fair values as these instruments have floating interest rates. The fair values of the Series A Notes and Series B Notes at September 30, 2016 and December 31, 2015 are based on discounted cash flows associated with the respective notes using current market rates of interest at those respective dates. For the Series A Notes, the current market rates used in measuring this fair value were 6.09% at September 30, 2016 and 6.66% at December 31, 2015. For the Series B Notes, the current market rates used in measuring this fair value were 6.33% at September 30, 2016 and 6.95% at December 31, 2015. These fair value estimates are based on observable market inputs and are considered Level 2 fair value estimates in the fair value hierarchy of fair value accounting.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	9 Months Ended
	Sep. 30, 2016
Accounting Changes And Error Corrections [Abstract]
Recently Issued Accounting Standards	13. Recently Issued Accounting Standards In May 2014, the FASB issued an accounting standards update to provide guidance on the recognition of revenue from customers. The FASB clarified this guidance in March, April and May 2016. Under this guidance, an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects what it expects in exchange for the goods or services. This guidance also requires more detailed disclosures to enable users of the financial statements to understand the nature, amount, timing and uncertainty, if any, of revenue and cash flows arising from contracts with customers. The requirements in this update are effective during interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In November 2015, the FASB issued an accounting standards update to provide guidance for the presentation of deferred tax liabilities and assets. Under this guidance, for a particular tax-paying component of an entity and within a particular tax jurisdiction, all deferred tax liabilities and assets, as well as any related valuation allowance, shall be offset and presented as a single noncurrent amount. The requirements in this update are effective during interim and annual periods beginning after December 15, 2016. The adoption of this update is not expected to have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued an accounting standards update to provide guidance for the accounting for leasing transactions. The requirements in this update are effective during interim and annual periods beginning after December 15, 2018. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In March 2016, the FASB issued an accounting standards update to provide guidance for 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. The requirements in this update are effective during interim and annual periods beginning after December 15, 2016. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In August 2016, the FASB issued an accounting standard to clarify the presentation of cash receipts and payments in specific situations on the statement of cash flows. The requirements in this update are effective during interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.

Basis of Consolidation and Pr23

Basis of Consolidation and Presentation (Tables)	9 Months Ended
	Sep. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Calculation of Basic and Diluted Net Loss per Share	The following table presents information necessary to calculate net loss per share for the three and nine month periods ended September 30, 2016 and 2015 as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 BASIC EPS: Net loss $ (84,143 ) $ (225,978 ) $ (240,512 ) $ (235,828 ) Adjust for loss attributed to holders of non-vested restricted stock — 2,359 — 2,436 Loss attributed to other common stockholders $ (84,143 ) $ (223,619 ) $ (240,512 ) $ (233,392 ) Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317 Basic net loss per common share $ (0.58 ) $ (1.54 ) $ (1.65 ) $ (1.61 ) DILUTED EPS: Loss attributed to other common stockholders $ (84,143 ) $ (223,619 ) $ (240,512 ) $ (233,392 ) Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317 Add dilutive effect of potential common shares — — — — Weighted average number of diluted common shares outstanding 146,326 145,662 146,014 145,317 Diluted net loss per common share $ (0.58 ) $ (1.54 ) $ (1.65 ) $ (1.61 ) Potentially dilutive securities excluded as anti-dilutive 9,141 7,840 9,141 7,840

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted	Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three and nine month periods ended September 30, 2016 and 2015 follow: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Volatility 34.87 % NA 35.11 % 37.95 % Expected term (in years) 5.00 NA 5.00 5.00 Dividend yield 0.42 % NA 2.05 % 2.00 % Risk-free interest rate 1.20 % NA 1.40 % 1.37 %
Stock Option Activity	Stock option activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Underlying Exercise Price Shares Per Share Outstanding at January 1, 2016 6,307,250 $ 21.68 Granted 969,900 $ 18.40 Exercised — $ — Cancelled — $ — Expired (550,000 ) $ 28.26 Outstanding at September 30, 2016 6,727,150 $ 20.67 Exercisable at September 30, 2016 5,266,379 $ 20.91
Restricted Stock Activity	Restricted stock activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Grant Date Fair Value Shares Per Share Non-vested restricted stock outstanding at January 1, 2016 1,432,250 $ 24.56 Granted 785,486 $ 20.58 Vested (709,008 ) $ 24.66 Forfeited (34,383 ) $ 24.89 Non-vested restricted stock outstanding September 30, 2016 1,474,345 $ 22.38
Restricted Stock Unit Activity	Restricted stock unit activity from January 1, 2016 to September 30, 2016 follows: Weighted Average Grant Date Fair Value Shares Per Share Non-vested restricted stock units outstanding at January 1, 2016 41,686 $ 26.22 Granted 178,254 $ 19.31 Vested (15,033 ) $ 27.30 Forfeited (7,668 ) $ 24.83 Non-vested restricted stock units outstanding September 30, 2016 197,239 $ 19.94
Performance Units	The total target number of shares with respect to the Performance Units for the awards in 2012-2016 is set forth below: 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Target number of shares 185,000 190,600 154,000 236,500 192,000
Fair Value of Performance Units	The fair value of the Performance Units is set forth below (in thousands): 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Fair value at date of grant $ 3,854 $ 4,052 $ 5,388 $ 5,564 $ 3,065
Compensation Expense Associated with Performance Units	These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Performance Units is shown below (in thousands): 2016 2015 2014 2013 2012 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Three months ended September 30, 2015 NA $ 338 $ 449 $ 464 NA Three months ended September 30, 2016 $ 321 $ 338 $ 449 NA NA Nine months ended September 30, 2015 NA $ 675 $ 1,347 $ 1,391 $ 255 Nine months ended September 30, 2016 $ 642 $ 1,013 $ 1,347 $ 464 NA

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2016
Property Plant And Equipment [Abstract]
Property and Equipment	Property and equipment consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Equipment $ 6,808,201 $ 6,963,148 Oil and natural gas properties 201,450 200,923 Buildings 96,950 96,470 Land 22,370 22,370 7,128,971 7,282,911 Less accumulated depreciation, depletion and impairment (3,617,231 ) (3,362,203 ) Property and equipment, net $ 3,511,740 $ 3,920,708

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Business Segments - Financial Information	The following tables summarize selected financial information relating to the Company’s business segments (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Revenues: Contract drilling $ 123,863 $ 262,196 $ 407,855 $ 953,025 Pressure pumping 78,165 154,407 248,428 580,752 Oil and natural gas 4,284 6,027 12,973 20,343 Total segment revenues 206,312 422,630 669,256 1,554,120 Elimination of intercompany revenues (a) (179 ) (379 ) (277 ) (1,409 ) Total revenues $ 206,133 $ 422,251 $ 668,979 $ 1,552,711 Operating income (loss): Contract drilling $ (67,786 ) $ (131,256 ) $ (173,331 ) $ (53,432 ) Pressure pumping (46,569 ) (183,464 ) (136,553 ) (217,224 ) Oil and natural gas 582 (1,824 ) (1,006 ) (10,017 ) (113,773 ) (316,544 ) (310,890 ) (280,673 ) Corporate and other (13,754 ) (14,333 ) (42,395 ) (44,519 ) Other operating income (expense), net (b) 4,118 1,362 10,285 (4,984 ) Interest income 63 323 273 924 Interest expense (10,244 ) (9,254 ) (31,722 ) (27,044 ) Other 19 16 52 16 Loss before income taxes $ (133,571 ) $ (338,430 ) $ (374,397 ) $ (356,280 ) September 30, December 31, 2016 2015 Identifiable assets: Contract drilling $ 3,113,229 $ 3,457,044 Pressure pumping 677,100 813,704 Oil and natural gas 31,347 34,073 Corporate and other (c) 87,197 224,663 Total assets $ 3,908,873 $ 4,529,484 (a) Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment. (b) Other operating income (expense) includes net gains or losses associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been excluded from the operating results of specific segments. This caption also includes expenses related to certain legal settlements net of insurance reimbursements. (c) Corporate and other assets primarily include cash on hand, income tax receivables, certain deferred tax assets and the assets of a business acquired in September 2016 that designs, manufactures, repairs and services pipe handling equipment and other rig components, including top drives and tubular tongs.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill by Operating Segment	Goodwill — All of the Company’s goodwill at both September 30, 2016 and December 31, 2015 related to the contract drilling operating segment. Goodwill as of September 30, 2016 and changes for the nine months then ended are as follows (in thousands): Nine Months Ended September 30, 2016 Balance at beginning of period $ 86,234 Changes to goodwill — Balance at end of period $ 86,234
Gross Carrying Amount and Accumulated Amortization of Customer Relationships	The following table presents the gross carrying amount and accumulated amortization of the customer relationships as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Gross Net Gross Net Carrying Accumulated Carrying Carrying Accumulated Carrying Amount Amortization Amount Amount Amortization Amount Customer relationships $ 25,500 $ (21,857 ) $ 3,643 $ 25,500 $ (19,125 ) $ 6,375

Accrued Expenses (Tables)

Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2016
Payables And Accruals [Abstract]
Summary of Accrued Expenses	Accrued expenses consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Salaries, wages, payroll taxes and benefits $ 23,259 $ 27,055 Workers' compensation liability 70,073 75,358 Property, sales, use and other taxes 11,082 9,061 Insurance, other than workers' compensation 9,392 12,817 Accrued interest payable 13,925 7,668 Other 26,497 29,652 Total $ 154,228 $ 161,611

Asset Retirement Obligation (Ta

Asset Retirement Obligation (Tables)	9 Months Ended
	Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]
Changes to Company's Asset Retirement Obligations	The following table describes the changes to the Company’s asset retirement obligations during the nine months ended September 30, 2016 and 2015 (in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of year $ 5,692 $ 5,301 Liabilities incurred 84 322 Liabilities settled (74 ) (118 ) Accretion expense 126 129 Revision in estimated costs of plugging oil and natural gas wells 42 — Asset retirement obligation at end of period $ 5,870 $ 5,634

Long Term Debt (Tables)

Long Term Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule of Principal Repayment Requirements of Long Term Debt	Presented below is a schedule of the principal repayment requirements of long-term debt as of September 30, 2016 (in thousands): Year ending December 31, 2016 $ — 2017 — 2018 — 2019 15,000 2020 300,000 Thereafter 300,000 Total $ 615,000

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Cash Dividends	The Company paid cash dividends during the nine months ended September 30, 2015 and 2016 as follows: 2015: Per Share Total (in thousands) Paid on March 25, 2015 $ 0.10 $ 14,640 Paid on June 24, 2015 0.10 14,712 Paid on September 24, 2015 0.10 14,712 Total cash dividends $ 0.30 $ 44,064 2016: Per Share Total (in thousands) Paid on March 24, 2016 $ 0.10 $ 14,712 Paid on June 23, 2016 0.02 2,953 Paid on September 22, 2016 0.02 2,953 Total cash dividends $ 0.14 $ 20,618
Treasury Stock Acquisition	Treasury stock acquisitions during the nine months ended September 30, 2016 were as follows (dollars in thousands): September 30, 2016 Shares Cost Treasury shares at beginning of period 43,207,240 $ 907,045 Purchases pursuant to stock buyback program 8,488 183 Acquisitions pursuant to long-term incentive plan 160,564 3,428 Treasury shares at end of period 43,376,292 $ 910,656

Fair Values of Financial Inst32

Fair Values of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Estimated Fair Value of Outstanding Debt Balances	The estimated fair value of the Company’s outstanding debt balances (including current portion) as of September 30, 2016 and December 31, 2015 is set forth below (in thousands): September 30, 2016 December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Borrowings under Credit Agreement: Revolving credit facility $ 15,000 $ 15,000 $ — $ — Term loan facility — — 70,000 70,000 2015 Term Loan — — 185,000 185,000 4.97% Series A Senior Notes 300,000 288,203 300,000 279,635 4.27% Series B Senior Notes 300,000 270,849 300,000 258,806 Total debt $ 615,000 $ 574,052 $ 855,000 $ 793,441

Basis of Consolidation and Pr33

Basis of Consolidation and Presentation - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Settlement of fund for eligible participants	$ (12.3)

Calculation of Basic and Dilute

Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
BASIC EPS:
Net loss	$ (84,143)	$ (225,978)	$ (240,512)	$ (235,828)
Adjust for loss attributed to holders of non-vested restricted stock		2,359		2,436
Loss attributed to other common stockholders	$ (84,143)	$ (223,619)	$ (240,512)	$ (233,392)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	146,326	145,662	146,014	145,317
Basic net loss per common share	$ (0.58)	$ (1.54)	$ (1.65)	$ (1.61)
DILUTED EPS:
Loss attributed to other common stockholders	$ (84,143)	$ (223,619)	$ (240,512)	$ (233,392)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	146,326	145,662	146,014	145,317
Weighted average number of diluted common shares outstanding	146,326	145,662	146,014	145,317
Diluted net loss per common share	$ (0.58)	$ (1.54)	$ (1.65)	$ (1.61)
Potentially dilutive securities excluded as anti-dilutive	9,141	7,840	9,141	7,840

Weighted-Average Assumptions Us

Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted (Detail) - Employee Stock Option	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility	34.87%	35.11%	37.95%
Expected term (in years)	5 years	5 years	5 years
Dividend yield	0.42%	2.05%	2.00%
Risk-free interest rate	1.20%	1.40%	1.37%

Stock Option Activity (Detail)

Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Underlying Shares
Outstanding at beginning of period | shares	6,307,250
Granted | shares	969,900
Expired | shares	(550,000)
Outstanding at end of period | shares	6,727,150
Exercisable at end of year | shares	5,266,379
Weighted Average Exercise Price Per Share
Outstanding at beginning of period | $ / shares	$ 21.68
Granted | $ / shares	18.40
Expired | $ / shares	28.26
Outstanding at end of period | $ / shares	20.67
Exercisable at end of year | $ / shares	$ 20.91

Restricted Stock Activity (Deta

Restricted Stock Activity (Detail) - Restricted Stock Awards	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Shares
Outstanding at beginning of period | shares	1,432,250
Granted | shares	785,486
Vested | shares	(709,008)
Forfeited | shares	(34,383)
Outstanding at end of period | shares	1,474,345
Weighted Average Grant Date Fair Value Per Share
Outstanding at beginning of period | $ / shares	$ 24.56
Granted | $ / shares	20.58
Vested | $ / shares	24.66
Forfeited | $ / shares	24.89
Outstanding at end of period | $ / shares	$ 22.38

Restricted Stock Unit Activity

Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Shares
Outstanding at beginning of period | shares	41,686
Granted | shares	178,254
Vested | shares	(15,033)
Forfeited | shares	(7,668)
Outstanding at end of period | shares	197,239
Weighted Average Grant Date Fair Value Per Share
Outstanding at beginning of period | $ / shares	$ 26.22
Granted | $ / shares	19.31
Vested | $ / shares	27.30
Forfeited | $ / shares	24.83
Outstanding at end of period | $ / shares	$ 19.94

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) - Performance Units Awards	9 Months Ended
	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
Basis of annual percentage exceeds	18.00%
Condition One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award description	Generally, the recipients will receive a target number of shares if the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 50th percentile. If the Company’s total shareholder return during the performance period is positive and, when compared to the peer group, is at the 75th percentile or higher, then the recipients will receive two times the target number of shares.
Condition Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award description	if, during the two-year period ending March 31, 2018, the Company’s total shareholder return for any 30 consecutive day period equals or exceeds 18 percent on an annualized basis from April 1, 2013 through the last day of such 30 consecutive day period, and the recipient is actively employed by the Company through the last day of the extended performance period, then the Company will issue to the recipient the number of shares equal to the amount the recipient would have been entitled to receive had the Company’s total shareholder return been positive during the initial three year performance period.

Performance Units (Detail)

Performance Units (Detail)	9 Months Ended
	Sep. 30, 2016shares
2,016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	185,000
2,015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	190,600
2,014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	154,000
2,013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	236,500
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	192,000

Fair Value of Performance Units

Fair Value of Performance Units (Detail) - Performance Units Awards $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
2,016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	$ 3,854
2,015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	4,052
2,014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	5,388
2,013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	5,564
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value at date of grant	$ 3,065

Compensation Expense Associated

Compensation Expense Associated with Performance Units (Detail) - Performance Units Awards - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
2,016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Performance Units	$ 321		$ 642
2,015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Performance Units	338	$ 338	1,013	$ 675
2,014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Performance Units	$ 449	449	1,347	1,347
2,013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Performance Units		$ 464	$ 464	1,391
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Performance Units				$ 255

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Total property and equipment	$ 7,128,971	$ 7,282,911
Less accumulated depreciation, depletion and impairment	(3,617,231)	(3,362,203)
Property and equipment, net	3,511,740	3,920,708
Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	6,808,201	6,963,148
Oil and natural gas properties
Property Plant And Equipment [Line Items]
Total property and equipment	201,450	200,923
Buildings
Property Plant And Equipment [Line Items]
Total property and equipment	96,950	96,470
Land
Property Plant And Equipment [Line Items]
Total property and equipment	$ 22,370	$ 22,370

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property Plant And Equipment [Line Items]
Future net cash flow discount rate			10.00%
Impairment expense related to oil and natural gas properties	$ 205,000		$ 2,400,000
Drilling Equipment
Property Plant And Equipment [Line Items]
Write-down of property and equipment		$ 131,000,000		$ 131,000,000
Pressure Pumping
Property Plant And Equipment [Line Items]
Write-down of property and equipment		$ 22,000,000		$ 22,000,000

Business Segments - Additional

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016Segment
Segment Reporting [Abstract]
Number of reportable business segments	3

Business Segments - Revenues (D

Business Segments - Revenues (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		$ 206,133	$ 422,251	$ 668,979	$ 1,552,711
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		206,312	422,630	669,256	1,554,120
Operating Segments | Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		123,863	262,196	407,855	953,025
Operating Segments | Pressure Pumping
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		78,165	154,407	248,428	580,752
Operating Segments | Oil and Natural Gas
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		4,284	6,027	12,973	20,343
Intersegment Elimination
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues	[1]	$ (179)	$ (379)	$ (277)	$ (1,409)
[1]	Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment.

Business Segments - Operating I

Business Segments - Operating Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (123,409)	$ (329,515)	$ (343,000)	$ (330,176)
Other operating income (expense), net	[1]	4,118	1,362	10,285	(4,984)
Interest income		63	323	273	924
Interest expense		(10,244)	(9,254)	(31,722)	(27,044)
Other		19	16	52	16
Loss before income taxes		(133,571)	(338,430)	(374,397)	(356,280)
Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(113,773)	(316,544)	(310,890)	(280,673)
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(67,786)	(131,256)	(173,331)	(53,432)
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(46,569)	(183,464)	(136,553)	(217,224)
Operating Segments | Oil and Natural Gas
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		582	(1,824)	(1,006)	(10,017)
Corporate and other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (13,754)	$ (14,333)	$ (42,395)	$ (44,519)
[1]	Other operating income (expense) includes net gains or losses associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been excluded from the operating results of specific segments. This caption also includes expenses related to certain legal settlements net of insurance reimbursements.

Business Segments - Assets (Det

Business Segments - Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 3,908,873	$ 4,529,484
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		3,113,229	3,457,044
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		677,100	813,704
Operating Segments | Oil and Natural Gas
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		31,347	34,073
Corporate and other
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	$ 87,197	$ 224,663
[1]	Corporate and other assets primarily include cash on hand, income tax receivables, certain deferred tax assets and the assets of a business acquired in September 2016 that designs, manufactures, repairs and services pipe handling equipment and other rig components, including top drives and tubular tongs.

Goodwill by Operating Segment (

Goodwill by Operating Segment (Detail) - Contract Drilling $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 86,234
Changes to goodwill	0
Balance at end of period	$ 86,234

Goodwill and Intangible Asset50

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Line Items]
Accumulated impairment losses	$ 0		$ 0		$ 0
Goodwill impairment charge		$ 124,561,000		$ 124,561,000
Pressure Pumping
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment charge		125,000,000
Pressure Pumping | Customer Relationships
Goodwill And Intangible Assets Disclosure [Line Items]
Amortization period (in years)			7 years
Amortization expense	$ 911,000	$ 911,000	$ 2,700,000	$ 2,700,000

Gross Carrying Amount and Accum

Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - Customer Relationships - Pressure Pumping - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,500	$ 25,500
Accumulated Amortization	(21,857)	(19,125)
Net Carrying Amount	$ 3,643	$ 6,375

Summary of Accrued Expenses (De

Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Salaries, wages, payroll taxes and benefits	$ 23,259	$ 27,055
Workers' compensation liability	70,073	75,358
Property, sales, use and other taxes	11,082	9,061
Insurance, other than workers' compensation	9,392	12,817
Accrued interest payable	13,925	7,668
Other	26,497	29,652
Accrued expenses	$ 154,228	$ 161,611

Changes to Company's Asset Reti

Changes to Company's Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]
Balance at beginning of year	$ 5,692	$ 5,301
Liabilities incurred	84	322
Liabilities settled	(74)	(118)
Accretion expense	126	129
Revision in estimated costs of plugging oil and natural gas wells	42
Asset retirement obligation at end of period	$ 5,870	$ 5,634

Long Term Debt - Credit Facilit

Long Term Debt - Credit Facilities - Additional Information (Detail)	Jul. 08, 2016USD ($)	Mar. 16, 2015	Sep. 27, 2012USD ($)	Sep. 30, 2016USD ($)Covenant	Sep. 30, 2015USD ($)	Jan. 01, 2017	Oct. 01, 2016	Dec. 31, 2015USD ($)	Mar. 18, 2015USD ($)
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 600,000,000
Aggregate amount by which the revolving credit facility can be increased	100,000,000
Debt maturity date				Sep. 27, 2017
Proceeds from long-term debt					$ 200,000,000
Total assets				$ 3,908,873,000				$ 4,529,484,000
Letters of credit outstanding				38,200,000
Maximum | Subsidiaries
Debt Instrument [Line Items]
Total assets				1,000,000
Letter of Credit
Debt Instrument [Line Items]
Line of credit, amount outstanding				$ 0
Credit Agreement
Debt Instrument [Line Items]
Credit agreement date				Sep. 27, 2012
Commitment fee payable to the lenders for the unused portion of the credit facility				0.50%
Credit agreement, financial covenant description				The Company must not permit its debt to capitalization ratio to exceed 40%. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2016
Credit agreement, financial covenant compliance				The Company was in compliance with these covenants
Number of compliance covenants | Covenant				2
Credit Agreement | Minimum
Debt Instrument [Line Items]
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter				300.00%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Debt to capitalization ratio, percentage the Company must not exceed at any time				40.00%
Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.75%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Scenario Forecast
Debt Instrument [Line Items]
Applicable margin						2.75%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Subsequent Event
Debt Instrument [Line Items]
Applicable margin							2.75%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum | Until September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.75%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum | Beginning September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.25%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum | Until September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.25%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum | Beginning September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.75%
Credit Agreement | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.75%
Credit Agreement | Base Rate | Scenario Forecast
Debt Instrument [Line Items]
Applicable margin						1.75%
Credit Agreement | Base Rate | Subsequent Event
Debt Instrument [Line Items]
Applicable margin							1.75%
Credit Agreement | Base Rate | Minimum | Until September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.75%
Credit Agreement | Base Rate | Minimum | Beginning September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.25%
Credit Agreement | Base Rate | Maximum | Until September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.25%
Credit Agreement | Base Rate | Maximum | Beginning September 27, 2017
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.75%
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 500,000,000
Credit Agreement | Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	50,000,000
Credit Agreement | Revolving Credit Facility | Swing Line Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	20,000,000
Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Proceeds from long-term debt			$ 100,000,000
Line of credit facility, frequency of payments				Quarterly
Amended Credit Agreement
Debt Instrument [Line Items]
Credit agreement amendment date				Jul. 8, 2016
Debt maturity date				Mar. 27, 2019
Line of credit, amount outstanding	$ 357,900,000			$ 15,000,000
Maximum percentage allowed to invest in foreign subsidiaries or joint ventures on book value basis	20.00%
Maximum cash balance allowed	$ 100,000,000
Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Debt service coverage ratio	150.00%
Amended Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit, weighted average interest rate				4.00%
Line of credit, available borrowing capacity				$ 317,000,000
Reimbursement Agreement
Debt Instrument [Line Items]
Letters of credit outstanding				$ 38,200,000
Reimbursement Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%
2015 Term Loan Agreement
Debt Instrument [Line Items]
Line of credit, amount outstanding									$ 200,000,000
Line of credit facility, frequency of payments				Quarterly
Line of credit facility, frequency of payment and payment terms				The Term Loan Borrowing was payable in quarterly principal installments, together with accrued interest. Loans under the 2015 Term Loan Agreement bore interest, at the Company’s election, at the per annum rate of LIBOR rate plus 3.25% or base rate plus 2.25%.
2015 Term Loan Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.25%
2015 Term Loan Agreement | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.25%

Long Term Debt - Senior Notes -

Long Term Debt - Senior Notes - Additional Information (Detail)	Jun. 14, 2012USD ($)Covenant	Oct. 05, 2010USD ($)Covenant	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Debt Instrument [Line Items]
Debt maturity date					Sep. 27, 2017
Interest expense related to amortization of debt issuance costs			$ 2,000,000	$ 746,000	$ 3,500,000	$ 2,000,000
4.97% Series A Senior Notes, Due October 5th 2020
Debt Instrument [Line Items]
Debt maturity date		Oct. 5, 2020
Long-term debt, aggregate principal amount		$ 300,000,000
Debt interest rate		4.97%
Semi-annual interest payment, first payment date					April 5
Semi-annual interest payment, second payment date					October 5
Notes issuance date		Oct. 5, 2010
Description of the prepayment terms					Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium		100.00%
Description of the acceptance terms					If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.
Acceptance terms, percent of principal before accrued and unpaid interest		100.00%
Note purchase agreement, financial covenant description					The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2016.
Number of compliance covenants | Covenant		2
4.97% Series A Senior Notes, Due October 5th 2020 | Minimum
Debt Instrument [Line Items]
Debt instrument, prepayment percentage of aggregate principal amount		5.00%
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter		2.50%
4.97% Series A Senior Notes, Due October 5th 2020 | Maximum
Debt Instrument [Line Items]
Debt to capitalization ratio, percentage the Company must not exceed at any time		50.00%
4.27% Series B Senior Notes, Due June 14th 2022
Debt Instrument [Line Items]
Debt maturity date	Jun. 14, 2022
Long-term debt, aggregate principal amount	$ 300,000,000
Debt interest rate	4.27%
Semi-annual interest payment, first payment date					April 5
Semi-annual interest payment, second payment date					October 5
Notes issuance date	Jun. 14, 2012
Description of the prepayment terms					Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium	100.00%
Description of the acceptance terms					If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.
Acceptance terms, percent of principal before accrued and unpaid interest	100.00%
Note purchase agreement, financial covenant description					The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at September 30, 2016.
Number of compliance covenants | Covenant	2
4.27% Series B Senior Notes, Due June 14th 2022 | Minimum
Debt Instrument [Line Items]
Debt instrument, prepayment percentage of aggregate principal amount	5.00%
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter	2.50%
4.27% Series B Senior Notes, Due June 14th 2022 | Maximum
Debt Instrument [Line Items]
Debt to capitalization ratio, percentage the Company must not exceed at any time	50.00%
2012 and 2015 Term Loan Agreements
Debt Instrument [Line Items]
Early termination of term loan agreements			$ 1,400,000		$ 1,400,000

Schedule of Principal Repayment

Schedule of Principal Repayment Requirements of Long Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2,019	$ 15,000
2,020	300,000
Thereafter	300,000
Total	$ 615,000	$ 855,000

Commitments Contingencies and O

Commitments Contingencies and Other Matters - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Nov. 30, 2011
Commitments and Contingencies Disclosure [Line Items]
Letters of credit, collateral for retained losses	$ 38,200,000
Commitments to purchase major equipment	64,200,000
Current obligation	22,000,000
Purchase obligations for remainder of 2016	5,000,000
Advances to Vendor
Commitments and Contingencies Disclosure [Line Items]
Advance to non-affiliates	11,800,000
Repayment of notes receivable	10,600,000
Notes receivable outstanding	1,200,000
Advances to Vendor | Maximum
Commitments and Contingencies Disclosure [Line Items]
Advance to non-affiliates		$ 12,000,000
Letter of Credit
Commitments and Contingencies Disclosure [Line Items]
Amount drawn under letters of credit	$ 0

Cash Dividends (Detail)

Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.02	$ 0.10	$ 0.14	$ 0.30
Cash dividends paid			$ 20,618	$ 44,064
Installment 1, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date				Mar. 25, 2015
Cash dividends paid, per share				$ 0.10
Cash dividends paid				$ 14,640
Installment 2, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date				Jun. 24, 2015
Cash dividends paid, per share				$ 0.10
Cash dividends paid				$ 14,712
Installment 3, FY 2015
Dividends Payable [Line Items]
Cash dividends paid, date				Sep. 24, 2015
Cash dividends paid, per share				$ 0.10
Cash dividends paid				$ 14,712
Installment 1, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date			Mar. 24, 2016
Cash dividends paid, per share			$ 0.10
Cash dividends paid			$ 14,712
Installment 2, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date			Jun. 23, 2016
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 2,953
Installment 3, FY 2016
Dividends Payable [Line Items]
Cash dividends paid, date			Sep. 22, 2016
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 2,953

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Oct. 26, 2016	Sep. 15, 2016	Sep. 30, 2016	Sep. 06, 2013
Class Of Stock [Line Items]
Shares issued for acquisition, value			$ 6,733,000
Common Stock
Class Of Stock [Line Items]
Shares issued for acquisition		353,804	354,000
Shares issued for acquisition, value		$ 6,700,000	$ 3,000
2013 program
Class Of Stock [Line Items]
Remaining amount approved for repurchases under stock buyback program			$ 187,000,000
2013 program | Maximum
Class Of Stock [Line Items]
Amount approved for repurchases under stock buyback program				$ 200,000,000
Subsequent Event | Dividend Declared
Class Of Stock [Line Items]
Dividend declaration date	Oct. 26, 2016
Dividend per share, declared	$ 0.02
Dividend payment date	Dec. 22, 2016
Dividend record date	Dec. 8, 2016

Treasury Stock Acquisition (Det

Treasury Stock Acquisition (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)shares
Schedule of Treasury Stock [Line Items]
Treasury shares at beginning of period | shares	43,207,240
Treasury shares at end of period | shares	43,376,292
Treasury shares at beginning of period	$ 907,045
Treasury stock acquired, cost	3,611
Treasury shares at end of period	$ 910,656
Stock Buyback Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, shares | shares	8,488
Treasury stock acquired, cost	$ 183
Long Term Incentive Plan
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, shares | shares	160,564
Treasury stock acquired, cost	$ 3,428

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	35.80%	33.80%

Estimated Fair Value of Outstan

Estimated Fair Value of Outstanding Debt Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	$ 615,000	$ 855,000
Fair value of Debt	574,052	793,441
Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	15,000
Fair value of Debt	15,000
Term Loan Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt		70,000
Fair value of Debt		70,000
2015 Term Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt		185,000
Fair value of Debt		185,000
4.97% Series A Senior Notes, Due October 5th 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	300,000	300,000
Fair value of Debt	288,203	279,635
4.27% Series B Senior Notes, Due June 14th 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	300,000	300,000
Fair value of Debt	$ 270,849	$ 258,806

Fair Values of Financial Inst63

Fair Values of Financial Instruments - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
4.97% Series A Senior Notes, Due October 5th 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current market rates used in measuring fair value	6.09%	6.66%
4.27% Series B Senior Notes, Due June 14th 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current market rates used in measuring fair value	6.33%	6.95%