Patterson-UTI Energy (PTEN) 10-Q 27 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 22, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
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		147,198,469

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 76,506	$ 43,012
Accounts receivable, net of allowance for doubtful accounts of $3,537 and $3,546 at June 30, 2015 and December 31, 2014, respectively	331,922	663,404
Federal and state income taxes receivable		81,726
Inventory	22,672	32,251
Deferred tax assets, net	33,879	37,075
Other	50,815	51,624
Total current assets	515,794	909,092
Property and equipment, net	4,246,147	4,131,071
Goodwill and intangible assets	218,992	220,813
Deposits on equipment purchases	47,741	112,379
Other	20,854	20,656
Total assets	5,049,528	5,394,011
Current liabilities:
Accounts payable	223,001	382,438
Federal and state income taxes payable	11,153
Accrued expenses	171,453	173,466
Current portion of long-term debt	42,500	12,500
Total current liabilities	448,107	568,404
Borrowings under revolving credit facility		303,000
Other long-term debt	830,000	670,000
Deferred tax liabilities, net	892,239	935,660
Other	11,170	11,137
Total liabilities	$ 2,181,516	$ 2,488,201
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 190,406,843 and 189,262,876 issued and 147,199,603 and 146,444,291 outstanding at June 30, 2015 and December 31, 2014, respectively	$ 1,904	$ 1,893
Additional paid-in capital	999,622	984,674
Retained earnings	2,772,613	2,811,815
Accumulated other comprehensive income	918	6,463
Treasury stock, at cost, 43,207,240 shares and 42,818,585 shares at June 30, 2015 and December 31, 2014, respectively	(907,045)	(899,035)
Total stockholders' equity	2,868,012	2,905,810
Total liabilities and stockholders' equity	$ 5,049,528	$ 5,394,011

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 3,537	$ 3,546
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	190,406,843	189,262,876
Common stock, outstanding	147,199,603	146,444,291
Treasury stock, shares	43,207,240	42,818,585

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating revenues:
Total operating revenues		$ 472,761	$ 757,276	$ 1,130,460	$ 1,435,444
Operating costs and expenses:
Contract drilling		153,848	255,318	366,658	506,377
Pressure pumping		142,756	241,977	355,481	441,785
Oil and natural gas		2,779	2,872	5,577	6,146
Depreciation, depletion, amortization and impairment		181,924	153,426	357,306	300,748
Selling, general and administrative		19,216	19,548	52,013	39,221
Net gain on asset disposals	[1]	(2,998)	(3,091)	(5,914)	(4,835)
Total operating costs and expenses		497,525	670,050	1,131,121	1,289,442
Operating income (loss)		(24,764)	87,226	(661)	146,002
Other income (expense):
Interest income		318	208	601	384
Interest expense, net of amount capitalized		$ (9,249)	(7,249)	$ (17,790)	(14,437)
Other			3		3
Total other expense		$ (8,931)	(7,038)	$ (17,189)	(14,050)
Income (loss) before income taxes		(33,695)	80,188	(17,850)	131,952
Income tax expense (benefit):
Current		1,705	25,680	32,225	52,615
Deferred		(16,425)	225	(40,225)	(9,768)
Total income tax expense (benefit)		(14,720)	25,905	(8,000)	42,847
Net income (loss)		$ (18,975)	$ 54,283	$ (9,850)	$ 89,105
Net income (loss) per common share:
Basic		$ (0.13)	$ 0.37	$ (0.07)	$ 0.62
Diluted		$ (0.13)	$ 0.37	$ (0.07)	$ 0.61
Weighted average number of common shares outstanding:
Basic		145,300	143,622	145,142	143,259
Diluted		145,984	146,029	145,712	145,586
Cash dividends per common share		$ 0.10	$ 0.10	$ 0.20	$ 0.20
Contract Drilling
Operating revenues:
Oil and gas services		$ 288,321	$ 438,583	$ 689,799	$ 864,486
Pressure Pumping
Operating revenues:
Oil and gas services		176,624	306,577	426,345	546,838
Oil And Natural Gas
Operating revenues:
Oil and natural gas		$ 7,816	$ 12,116	$ 14,316	$ 24,120
[1]	Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (18,975)	$ 54,283	$ (9,850)	$ 89,105
Other comprehensive income (loss), net of taxes of $0 for all periods:
Foreign currency translation adjustment	3,033	4,488	(5,545)	1,133
Total comprehensive income (loss)	$ (15,942)	$ 58,771	$ (15,395)	$ 90,238

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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 - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2014	$ 2,905,810	$ 1,893	$ 984,674	$ 2,811,815	$ 6,463	$ (899,035)
Beginning Balance (in shares) at Dec. 31, 2014	189,262,876	189,263,000
Net income (loss)	$ (9,850)			$ (9,850)
Foreign currency translation adjustment	$ (5,545)				$ (5,545)
Issuance of restricted stock (in shares)		1,176,000
Issuance of restricted stock		$ 12	$ (12)
Vesting of stock unit awards (in shares)		15,000
Vesting of stock unit awards
Forfeitures of restricted stock (in shares)		(47,000)
Forfeitures of restricted stock	$ (1)	$ (1)
Stock-based compensation	13,831		$ 13,831
Tax benefit related to stock-based compensation	1,129		$ 1,129
Payment of cash dividends	(29,352)			$ (29,352)
Purchase of treasury stock	(8,010)					$ (8,010)
Ending Balance at Jun. 30, 2015	$ 2,868,012	$ 1,904	$ 999,622	$ 2,772,613	$ 918	$ (907,045)
Ending Balance (in shares) at Jun. 30, 2015	190,406,843	190,407,000

CONDENSED CONSOLIDATED STATEME8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)		$ (9,850)	$ 89,105
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment		357,306	300,748
Dry holes and abandonments		114	321
Deferred income tax benefit		(40,225)	(9,768)
Stock-based compensation expense		13,831	12,959
Net gain on asset disposals	[1]	(5,914)	(4,835)
Changes in operating assets and liabilities:
Accounts receivable		330,176	(56,963)
Income taxes receivable/payable		93,527	(13,473)
Inventory and other assets		12,077	(21,896)
Accounts payable		(108,424)	50,012
Accrued expenses		(1,894)	12,122
Other liabilities		(63)	1,847
Net cash provided by operating activities		640,661	360,179
Cash flows from investing activities:
Purchases of property and equipment and acquisitions		(463,633)	(488,038)
Proceeds from disposal of assets		10,728	14,991
Net cash used in investing activities		(452,905)	(473,047)
Cash flows from financing activities:
Purchases of treasury stock		(8,010)	(13,554)
Dividends paid		(29,352)	(29,018)
Tax benefit related to stock-based compensation		1,129	8,556
Debt issuance costs		(1,979)
Proceeds from long-term debt		200,000
Repayment of long-term debt		(10,000)	(5,000)
Proceeds from borrowings under revolving credit facility		54,000
Repayment of borrowings under revolving credit facility		(357,000)
Proceeds from exercise of stock options			22,265
Net cash used in financing activities		(151,212)	(16,751)
Effect of foreign exchange rate changes on cash		(3,050)	947
Net increase (decrease) in cash and cash equivalents		33,494	(128,672)
Cash and cash equivalents at beginning of period		43,012	249,509
Cash and cash equivalents at end of period		76,506	120,837
Net cash (paid) received during the period for:
Interest, net of capitalized interest of $3,343 in 2015 and $3,326 in 2014		(16,506)	(13,360)
Income taxes		63,740	(54,089)
Non-cash investing and financing activities:
Net (decrease) increase in payables for purchase of property and equipment		(50,487)	96,143
Net decrease (increase) in deposits on equipment purchases		$ 64,638	$ (25,558)
[1]	Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

CONDENSED CONSOLIDATED STATEME9

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement Of Cash Flows [Abstract]
Interest expense, capitalized interest	$ 3,343	$ 3,326

Basis of Consolidation and Pres

Basis of Consolidation and Presentation	6 Months Ended
	Jun. 30, 2015
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 adjustments which are of a normal recurring nature 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, 201 4 , 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, 201 4 . The re sults of operations for the six months ended June 30 , 2015 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. The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value. 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 income (loss) per share for the three and six month periods ended June 30 , 2015 and 201 4 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 Six Months Ended June 30, June 30, 2015 2014 2015 2014 BASIC EPS: Net income (loss) $ (18,975 ) $ 54,283 $ (9,850 ) $ 89,105 Adjust for (income) loss attributed to holders of non-vested restricted stock 198 (559 ) 109 (910 ) Income (loss) attributed to common stockholders $ (18,777 ) $ 53,724 $ (9,741 ) $ 88,195 Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259 Basic net income (loss) per common share $ (0.13 ) $ 0.37 $ (0.07 ) $ 0.62 DILUTED EPS: Income (loss) attributed to common stockholders $ (18,777 ) $ 53,724 $ (9,741 ) $ 88,195 Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259 Add dilutive effect of potential common shares 684 2,407 570 2,327 Weighted average number of diluted common shares outstanding 145,984 146,029 145,712 145,586 Diluted net income (loss) per common share $ (0.13 ) $ 0.37 $ (0.07 ) $ 0.61 Potentially dilutive securities excluded as anti-dilutive 5,028 432 5,728 432

Stock-based Compensation

Stock-based Compensation	6 Months Ended
	Jun. 30, 2015
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 and have included service 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 the 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 s tock options granted for the three and six month periods ended June 30 , 2015 and 2014 follow: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Volatility 37.91 % 35.89% 37.95 % 35.89 % Expected term (in years) 5.00 5.00 5.00 5.00 Dividend yield 1.97 % 1.21% 2.00 % 1.17 % Risk-free interest rate 1.35 % 1.76% 1.37 % 1.76 % Stock option activity from January 1, 2015 to June 30 , 2015 follows: Weighted Average Underlying Exercise Shares Price Outstanding at January 1, 2015 6,086,250 $ 22.32 Granted 831,000 $ 20.06 Exercised — — Cancelled (10,000 ) $ 16.59 Expired (300,000 ) $ 24.63 Outstanding at June 30, 2015 6,607,250 $ 21.94 Exercisable at June 30, 2015 $ 5,333,927 $ 21.62 Restricted Stock — For all restricted stock awards 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, 2015 to June 30 , 2015 follows: Weighted Average Grant Date Shares Fair Value Non-vested restricted stock outstanding at January 1, 2015 1,493,059 $ 26.93 Granted 792,100 $ 20.60 Vested (679,565 ) $ 24.54 Forfeited (46,632 ) $ 26.90 Non-vested restricted stock outstanding June 30, 2015 1,558,962 $ 24.76 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, 2015 to June 30 , 2015 follows: Weighted Average Grant Date Shares Fair Value Non-vested restricted stock units outstanding at January 1, 2015 34,085 $ 30.20 Granted 22,100 $ 20.85 Vested (14,499 ) $ 27.37 Forfeited — — Non-vested restricted stock units outstanding June 30, 2015 41,686 $ 26.22 Performance Unit Awards — In 2011, 2012, 2013, 2014 and 2015 , the Company granted stock-settled performance unit awards to certain executive officers (the “Stock-Settled Performance Units”). The Stock-Settled Performance Units provide for the recipients to receive a grant of shares of stock upon the achievement of certain performance goals established by the Compensation Committee during the performance period. The performance units will only have a payout if total shareholder return is positive for the performance period and, when compared to the peer group, is at or above the 25th percentile. The performance period for the Stock-Settled Performance Units is the three year period commencing on April 1 of the year of grant. For the 2012 and 2013 Stock-Settled Performance Units, the performance period can extend for an additional two years in certain circumstances. The performance goals for the Stock-Settled 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 performance units. Generally, the recipients will receive a target number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 50 th percentile and two times the target if at the 75 th percentile or higher. If the Company’s total shareholder return is positive, and, when compared to the peer group, is at the 25 th percentile, the recipients will only receive one-half of the target number of shares. The grant of shares when achievement is between the 25 th and 75 th percentile will be determined on a pro-rata basis. The target number of shares with respect to the 2012 Stock-Settled Performance Units was 192,000 . The performance period for the 2012 Stock-Settled Performance Units ended on March 31, 2015, and the Company’s total shareholder return was at the 87 th percentile. In April 2015, 384,000 shares were issued to settle the 2012 Stock-Settled Performance Units. The total target number of shares with respect to the Stock-Settled Performance Units is set forth below: 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Target number of shares 190,600 154,000 236,500 192,000 144,375 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 Stock-Settled Performance Units is set forth below (in thousands): 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Fair value at date of grant $ 4,052 $ 5,388 $ 5,564 $ 3,065 $ 5,569 These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands): 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Three months ended June 30, 2014 NA $ 449 $ 464 $ 255 NA Three months ended June 30, 2015 $ 338 $ 449 $ 464 NA NA Six months ended June 30, 2014 NA $ 449 $ 928 $ 510 $ 464 Six months ended June 30, 2015 $ 338 $ 898 $ 928 $ 255 NA

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2015
Property Plant And Equipment [Abstract]
Property and Equipment	3 . Property and Equipment Property and equipment consisted of the following at June 30 , 2015 and December 31, 2014 (in thousands): June 30, December 31, 2015 2014 Equipment $ 7,025,433 $ 6,679,894 Oil and natural gas properties 199,873 196,234 Buildings 90,029 83,465 Land 22,542 12,038 7,337,877 6,971,631 Less accumulated depreciation, depletion and impairment (3,091,730 ) (2,840,560 ) Property and equipment, net $ 4,246,147 $ 4,131,071

Business Segments

Business Segments	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Business Segments	4 . Business Segments The Company’s revenues, operating profits 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. These segments have separate management teams which report 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. Separate financial data for each of our business segments is provided in the table below (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Revenues: Contract drilling $ 288,588 $ 440,027 $ 690,829 $ 866,989 Pressure pumping 176,624 306,577 426,345 546,838 Oil and natural gas 7,816 12,116 14,316 24,120 Total segment revenues 473,028 758,720 1,131,490 1,437,947 Elimination of intercompany revenues (a) (267 ) (1,444 ) (1,030 ) (2,503 ) Total revenues $ 472,761 $ 757,276 $ 1,130,460 $ 1,435,444 Income (loss) before income taxes: Contract drilling $ 9,426 $ 69,617 $ 65,564 $ 136,694 Pressure pumping (18,744 ) 24,910 (33,760 ) 26,453 Oil and natural gas (3,631 ) 3,632 (8,193 ) 6,335 (12,949 ) 98,159 23,611 169,482 Corporate and other (14,813 ) (14,024 ) (30,186 ) (28,315 ) Net gain on asset disposals (b) 2,998 3,091 5,914 4,835 Interest income 318 208 601 384 Interest expense (9,249 ) (7,249 ) (17,790 ) (14,437 ) Other — 3 — 3 Income (loss) before income taxes $ (33,695 ) $ 80,188 $ (17,850 ) $ 131,952 June 30, December 31, 2015 2014 Identifiable assets: Contract drilling $ 3,859,000 $ 4,000,576 Pressure pumping 1,049,778 1,186,010 Oil and natural gas 41,684 50,945 Corporate and other (c) 99,066 156,480 Total assets $ 5,049,528 $ 5,394,011 (a) Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment. (b) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments. (c) Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	5 . Goodwill and Intangible Assets Goodwill — Goodwill by operating segment as of June 30 , 2015 and changes for the six months then ended are as follows (in thousands): Contract Pressure Drilling Pumping Total Balance December 31, 2014 $ 86,234 $ 124,561 $ 210,795 Changes to goodwill — — — Balance June 30, 2015 $ 86,234 $ 124,561 $ 210,795 There were no accumulated impairment losses as of June 30 , 2015 or December 31, 2014 . Goodwill is evaluated at least annually on December 31, or when circumstances require, to determine if the fair value of recorded goodwill has decreased below its carrying value. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. The Company’s reporting units for impairment testing have been determined to be 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. If so, then goodwill impairment is determined using a two-step 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 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 impairment test is performed whereby the fair value of the reporting unit is allocated to its identifiable tangible and 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 in the amount of the shortfall. 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 w as 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 June 30 , 201 5 and 2014 , and amortization expense of approximately $ 1.8 million was recorded in the six months ended June 30, 2015 and 2014 associated with customer relationships. The following table presents the gross carrying amount and accumulated amortization of the customer relationships as of June 30 , 2015 and December 31, 201 4 (in thousands): June 30, 2015 December 31, 2014 Gross Net Gross Net Carrying Accumulated Carrying Carrying Accumulated Carrying Amount Amortization Amount Amount Amortization Amount Customer relationships $ 25,500 $ (17,303 ) $ 8,197 $ 25,500 $ (15,482 ) $ 10,018

Accrued Expenses

Accrued Expenses	6 Months Ended
	Jun. 30, 2015
Payables And Accruals [Abstract]
Accrued Expenses	6 . Accrued Expenses Accrued expenses consisted of the following at June 30 , 2015 and December 31, 2014 (in thousands): June 30, December 31, 2015 2014 Salaries, wages, payroll taxes and benefits $ 32,916 $ 52,956 Workers' compensation liability 75,072 77,348 Property, sales, use and other taxes 9,158 11,644 Insurance, other than workers' compensation 12,082 9,632 Accrued interest payable 7,419 7,427 Other 34,806 14,459 $ 171,453 $ 173,466

Asset Retirement Obligation

Asset Retirement Obligation	6 Months Ended
	Jun. 30, 2015
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 retire ment obligations during the six months ended June 30 , 2015 and 2014 (in thousands): Six Months Ended June 30, 2015 2014 Balance at beginning of year $ 5,301 $ 4,837 Liabilities incurred 271 91 Liabilities settled (65 ) (31 ) Accretion expense 86 84 Revision in estimated costs of plugging oil and natural gas wells — 20 Asset retirement obligation at end of period $ 5,593 $ 5,001

Long Term Debt

Long Term Debt	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Long Term Debt	8 . Long Term Debt Credit Facilities — On September 27, 2012, the Company entered into a Credit Agreement ( as amended, the “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 Credit Agreement is a committed senior unsecured credit facility that includes a revolving credit facility and a term loan facility. The revolving credit facility permits aggregate borrowings of up to $ 500 million outstanding at any time. The revolving credit facility contains a letter of credit facility that is limited to $ 150 million and a swing line facility that is limited to $ 40 million, in each case outstanding at any time. The term loan facility provides for a loan of $ 100 million, which was drawn on December 24, 2012. The term loan facility is payable in quarterly principal installments, which commenced December 27, 2012. The installment amounts vary from 1.25 % of the original principal amount for each of the first four quarterly installments, 2.50 % of the original principal amount for each of the subsequent eight quarterly installments, 5.00 % of the original principal amount for the subsequent four quarterly installments and 13.75 % of the original principal amount for the final four quarterly installments. Subject to customary conditions, the Company may request that the lenders’ aggregate commitments with respect to the revolving credit facility and/or the term loan facility be increased by up to $ 100 million, not to exceed total commitments of $ 700 million. The maturity date under the Credit Agreement is September 27, 2017 for both the revolving facility and the term facility. 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. The applicable margin on LIBOR rate loans varies from 2.25 % to 3.25 % and the applicable margin on base rate loans varies from 1.25 % to 2.25 %, in each case determined based upon the Company’s debt to capitalization ratio. As of June 30 , 2015 the applicable margin on LIBOR rate loans was 2. 7 5 % and the applicable margin on base rate loans was 1. 7 5 %. Based on the Company’s debt to capitalization ratio at March 31, 201 5 , the applicable margin on LIBOR loans is 2. 2 5 % and the applicable margin on base rate loans is 1. 2 5 % as of July 1, 2015. Based on the Company’s debt to capitalization ratio at June 30 , 2015, the applicable margin on LIBOR loans will be 2.25 % and the applicable margin on base rate loans will be 1.25 % as of October 1, 2015. 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 will unconditionally guarantee 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 interest s 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 45 %. 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 June 30, 2015 . 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 June 30 , 2015 , the Company had $ 77.5 million principal amount outstanding under the term loan facility at an interest rate of 3.125 % and no amounts outstanding under the revolving credit facility. The Company currently ha s available borr owing capacity of $ 500 million under the revolving credit facility . 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 June 30 , 2015, the Company had $ 41.3 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 “Continuing Guaranty”), 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. 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 is 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 is payable in quarterly principal installments, together with accrued interest, on each June 30 , September 30 , December 31 and March 31 , commencing on June 30, 2015 . Each of the first four principal installments is in an amount equal to 2.5 % of the Term Loan Borrowing and each successive quarterly installment, until and including June 30, 2017, is in an amount equal to 5.0 % of the Term Loan Borrowing, with the outstanding principal balance of the Term Loan Borrowing due on the maturity date under the 2015 Term Loan Agreement. The maturity date under the 2015 Term Loan Agreement is September 27, 2017 . Loans under the 2015 Term Loan Agreement bear interest, at the Company’s election, at the per annum rate of LIBOR rate plus 3.25 % or base rate plus 2.25 %. Each domestic subsidiary of the Company will unconditionally guarantee all existing and future indebtedness and liabilities of the other guarantors and the Company arising under the 2015 Term Loan Agreement and other Loan Documents (as defined in the 2015 Term Loan 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. The 2015 Term Loan Agreement requires quarterly compliance with two financial covenants. The Company must not permit its debt to capitalization ratio to exceed 45 %. The 2015 Term Loan 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 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 2015 Term Loan Agreement generally defines the interest coverage ratio as the ratio of EBITDA of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at June 30, 2015. The 2015 Term Loan Agreement further provides that neither the Company nor its subsidiaries is permitted to make restricted payments unless, after giving effect to such restricted payment, its pro forma ratio of debt to EBITDA for the four prior fiscal quarters, determined as of the preceding ending quarterly period, does not exceed 2.50 to 1.00. Restricted payments are generally defined as (a) dividends and distributions made on account of equity interests of the Company or its subsidiaries and (b) payments made to redeem, repurchase or otherwise retire equity interests of the Company or its subsidiaries. Payments made solely in the form of common equity interests, made to the Company and its subsidiaries, or made in connection with the Company’s long term incentive plans are not restricted payments under the 2015 Term Loan Agreement. The 2015 Term Loan Agreement also contains customary representations, warranties, affirmative and negative covenants, and events of default. Events of default under the 2015 Term Loan 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 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). 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 will pay 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 will pay 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 immaterial subsidiaries. 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 that same period. The Company was in compliance with these covenants at June 30 , 2015 . 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. The Company incurred approximately $ 2.0 million in debt issuance costs during 2015 in connection with the Reimbursement Agreement and the 2015 Term Loan Agreement. Debt issuance costs are deferred and recognized as interest expense over the term of the underlying debt. Interest expense related to the amortization of debt issuance costs was approximately $ 743,000 for the three months ended June 30, 2015 and $ 547,000 for the t hree months ended June 30 , 201 4. Interest expense related to the amortization of debt issuance costs was approximately $ 1.3 million for the six months ended June 30, 2015 and $ 1.1 million for the six months ended June 30, 2014. Presented below is a schedule of the principal repayment requirements of long-term debt by fiscal year as of June 3 0 , 2015 (in thousands): Year ending December 31, 2015 17,500 2016 63,750 2017 191,250 2018 — 2019 — Thereafter 600,000 Total $ 872,500

Commitments, Contingencies and

Commitments, Contingencies and Other Matters	6 Months Ended
	Jun. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments, Contingencies and Other Matters	9 . Commitments, Contingencies and Other Matters As of June 30 , 2015 , the Company maintained letters of credit in the aggregate amount of $ 41.3 million for the benefit of various insurance companies as collateral for retrospective premiums and 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 r enewed. As of June 30 , 2015 , no amounts had been drawn under the letters of credit. As of June 30 , 2015 , the Company had commitments to purchase approximately $ 189 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 2016 , 2017 and 2018 . As of June 30 , 2015, the remaining obligation under these agreements was approximately $ 57.9 million, of which materials with a total purchase price of approximately $ 4.4 million were required to be purcha sed during the remainder of 2015 . In the event that 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 and bears interest at an annual rate of 5.0 %. Repayment of the advance is to be made through discounts applied to purchases from the vendor and repayment of all amounts advanced must be made no later than October 1, 2017. As of June 30 , 2015 , advances of approximately $ 11.8 million had been made under this agreement and principal repayments of approximately $ 10.4 million had been received resulting in a balance outstanding of approximately $ 1.4 million. In March 201 5 , the U.S. Equal Employment Opportunity Commission filed a lawsuit against the Company’s U.S. drilling subsidiary alleging that the subsidiary engaged in a pattern or practice of nationwide discrimination based on race, color, and/or national origin. In April 2015, a Federal court judge approved and signed a consent decree in which the parties agreed to settle the lawsuit on a no-fault basis and the subsidiary agreed to pay $ 12.3 million into a settlement fund for eligible participants. A $12.3 million charge related to this settlement was recorded in the first quarter of 2015. Other than the matter described above, 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	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Stockholders' Equity	1 0 . Stockholders’ Equity Cash Dividends — The Company pai d cash dividends during the six months ended June 30 , 2014 and 201 5 as follows: 2014: Per Share Total (in thousands) Paid on March 27, 2014 $ 0.10 $ 14,456 Paid on June 26, 2014 0.10 14,562 Total cash dividends $ 0.20 $ 29,018 2015: Per Share Total (in thousands) Paid on March 25, 2015 $ 0.10 $ 14,640 Paid on June 24, 2015 0.10 14,712 Total cash dividends $ 0.20 $ 29,352 On July 22 , 201 5 , the Company’s Board of Directors approved a cash dividend on its common stock in the amount of $ 0.10 per share to be paid on September 24 , 201 5 to holders of record as of September 10 , 201 5 . 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 credit facilities 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 June 30 , 2015 , 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. Treasury stock acquisitions during the six months ended June 30, 2015 were as follows (dollars in thousands): June 30, 2015 Shares Cost Treasury shares at beginning of period 42,818,585 $ 899,035 Acquisitions pursuant to long-term incentive plans 380,037 7,830 Purchases pursuant to the 2013 buyback program 8,618 180 Treasury shares at end of period 43,207,240 $ 907,045

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	1 1 . Income Taxes The Company’s effective income tax rate was 44.8 % for the six months ended June 30 , 2015 , compared to 32 . 5 % for the six months ended June 30 , 2014 . The Domestic Production Activities Deduction was enacted as part of the American Jobs Creation Act of 2004 (as revised by the Emergency Economic Stabilization Act of 2008), and allows a deduction of 9 % on the lesser of qualified production activities income or taxable income. For financial statement purposes, the Company expects a loss before income taxes for the year ending December 31, 2015; however, the Company currently expects to have taxable income for the year ending December 31, 2015, and the Domestic Production Activities Deduction is expected to provide a permanent tax benefit. On June 15, 2015, legislation was enacted which permanently reduced the Texas Margin Tax rate. This resulted in a permanent tax benefit that was recognized during the quarter ended June 30, 2015. T he interplay between the expected loss before income taxes for financial statement purposes , the permanent tax benefit expected to be provided by the Domestic Production Activities Deduction and the permanent tax benefit from the change in the Texas Margin Tax rate result ed in a higher effective income tax rate for the six months ended June 30 , 2015.

Fair Values of Financial Instru

Fair Values of Financial Instruments	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Values of Financial Instruments	1 2 . 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 June 30 , 2015 and December 31, 2014 is set forth below (in thousands): June 30, 2015 December 31, 2014 Carrying Fair Carrying Fair Value Value Value Value Borrowings under Credit Agreement: Revolving credit facility $ — $ — $ 303,000 $ 303,000 Term loan facility 77,500 77,500 82,500 82,500 2015 Term Loan 195,000 195,000 — — 4.97% Series A Senior Notes 300,000 310,660 300,000 288,346 4.27% Series B Senior Notes 300,000 294,629 300,000 269,173 Total debt $ 872,500 $ 877,789 $ 985,500 $ 943,019 The carrying values of the balances outstanding under the Credit Agreement and the 2015 Term Loan Agreement appr oximate their fair values as these instrument s ha ve a floating interest rate. The fair value of the Series A Notes and the Series B Notes at June 30 , 2015 and December 31, 201 4 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 4.21 % at June 30 , 2015 and 5.77 % at December 31, 201 4. For the Series B Notes, the current market rates used in measuring this fair value were 4.58 % at June 30 , 2015 and 6.00 % at December 31, 201 4 . 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	6 Months Ended
	Jun. 30, 2015
Accounting Changes And Error Corrections [Abstract]
Recently Issued Accounting Standards	1 3 . Recently Issued Accounting Standards In May 2014, the FASB issued an accounting standards update to provide guidance on the recognition of revenue from customers. 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 b eginning after December 15, 2017 . The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In June 2014, the FASB issued an accounting standards update to provide guidance on the accounting for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. The guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period is treated as a performance condition. The requirements in this update are effective during interim and annual periods beginning after December 15, 2015. The adoption of this update is not expected to have a material impact on the Company’s consolidated financial statements. In April 2015, the FASB issued an accounting standards updated to provide guidance for the presentation of debt issuance costs. Under this guidance, debt issuance costs shall be presented in the balance sheet as a direct deduction from the carrying amount of the related debt and shall not be classified as a deferred charge. Amortization of debt issuance costs shall continue to be reported as interest expense. The requirements in this update are effective during interim and annual periods beginning after December 15, 2015. The adoption of this update is not expected to have a material impact on the Company’s consolidated financial statements.

Basis of Consolidation and Pr23

Basis of Consolidation and Presentation (Tables)	6 Months Ended
	Jun. 30, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Calculation of Basic and Diluted Net Income (Loss) per Share	The following table presents information necessary to calculate net income (loss) per share for the three and six month periods ended June 30 , 2015 and 201 4 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 Six Months Ended June 30, June 30, 2015 2014 2015 2014 BASIC EPS: Net income (loss) $ (18,975 ) $ 54,283 $ (9,850 ) $ 89,105 Adjust for (income) loss attributed to holders of non-vested restricted stock 198 (559 ) 109 (910 ) Income (loss) attributed to common stockholders $ (18,777 ) $ 53,724 $ (9,741 ) $ 88,195 Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259 Basic net income (loss) per common share $ (0.13 ) $ 0.37 $ (0.07 ) $ 0.62 DILUTED EPS: Income (loss) attributed to common stockholders $ (18,777 ) $ 53,724 $ (9,741 ) $ 88,195 Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259 Add dilutive effect of potential common shares 684 2,407 570 2,327 Weighted average number of diluted common shares outstanding 145,984 146,029 145,712 145,586 Diluted net income (loss) per common share $ (0.13 ) $ 0.37 $ (0.07 ) $ 0.61 Potentially dilutive securities excluded as anti-dilutive 5,028 432 5,728 432

Stock-based Compensation (Table

Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2015
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 s tock options granted for the three and six month periods ended June 30 , 2015 and 2014 follow: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Volatility 37.91 % 35.89% 37.95 % 35.89 % Expected term (in years) 5.00 5.00 5.00 5.00 Dividend yield 1.97 % 1.21% 2.00 % 1.17 % Risk-free interest rate 1.35 % 1.76% 1.37 % 1.76 %
Stock Option Activity	Stock option activity from January 1, 2015 to June 30 , 2015 follows: Weighted Average Underlying Exercise Shares Price Outstanding at January 1, 2015 6,086,250 $ 22.32 Granted 831,000 $ 20.06 Exercised — — Cancelled (10,000 ) $ 16.59 Expired (300,000 ) $ 24.63 Outstanding at June 30, 2015 6,607,250 $ 21.94 Exercisable at June 30, 2015 $ 5,333,927 $ 21.62
Restricted Stock Activity	Restricted stock activity from January 1, 2015 to June 30 , 2015 follows: Weighted Average Grant Date Shares Fair Value Non-vested restricted stock outstanding at January 1, 2015 1,493,059 $ 26.93 Granted 792,100 $ 20.60 Vested (679,565 ) $ 24.54 Forfeited (46,632 ) $ 26.90 Non-vested restricted stock outstanding June 30, 2015 1,558,962 $ 24.76
Restricted Stock Unit Activity	Restricted stock unit activity from January 1, 2015 to June 30 , 2015 follows: Weighted Average Grant Date Shares Fair Value Non-vested restricted stock units outstanding at January 1, 2015 34,085 $ 30.20 Granted 22,100 $ 20.85 Vested (14,499 ) $ 27.37 Forfeited — — Non-vested restricted stock units outstanding June 30, 2015 41,686 $ 26.22
Stock-Settled Performance Units	The total target number of shares with respect to the Stock-Settled Performance Units is set forth below: 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Target number of shares 190,600 154,000 236,500 192,000 144,375
Fair Value of Stock-Settled Performance Units	The fair value of the Stock-Settled Performance Units is set forth below (in thousands): 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Fair value at date of grant $ 4,052 $ 5,388 $ 5,564 $ 3,065 $ 5,569
Compensation Expense Associated with Stock-Settled Performance Units	These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands): 2015 2014 2013 2012 2011 Performance Performance Performance Performance Performance Unit Awards Unit Awards Unit Awards Unit Awards Unit Awards Three months ended June 30, 2014 NA $ 449 $ 464 $ 255 NA Three months ended June 30, 2015 $ 338 $ 449 $ 464 NA NA Six months ended June 30, 2014 NA $ 449 $ 928 $ 510 $ 464 Six months ended June 30, 2015 $ 338 $ 898 $ 928 $ 255 NA

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2015
Property Plant And Equipment [Abstract]
Property and Equipment	Property and equipment consisted of the following at June 30 , 2015 and December 31, 2014 (in thousands): June 30, December 31, 2015 2014 Equipment $ 7,025,433 $ 6,679,894 Oil and natural gas properties 199,873 196,234 Buildings 90,029 83,465 Land 22,542 12,038 7,337,877 6,971,631 Less accumulated depreciation, depletion and impairment (3,091,730 ) (2,840,560 ) Property and equipment, net $ 4,246,147 $ 4,131,071

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Business Segments - Financial Information	Separate financial data for each of our business segments is provided in the table below (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Revenues: Contract drilling $ 288,588 $ 440,027 $ 690,829 $ 866,989 Pressure pumping 176,624 306,577 426,345 546,838 Oil and natural gas 7,816 12,116 14,316 24,120 Total segment revenues 473,028 758,720 1,131,490 1,437,947 Elimination of intercompany revenues (a) (267 ) (1,444 ) (1,030 ) (2,503 ) Total revenues $ 472,761 $ 757,276 $ 1,130,460 $ 1,435,444 Income (loss) before income taxes: Contract drilling $ 9,426 $ 69,617 $ 65,564 $ 136,694 Pressure pumping (18,744 ) 24,910 (33,760 ) 26,453 Oil and natural gas (3,631 ) 3,632 (8,193 ) 6,335 (12,949 ) 98,159 23,611 169,482 Corporate and other (14,813 ) (14,024 ) (30,186 ) (28,315 ) Net gain on asset disposals (b) 2,998 3,091 5,914 4,835 Interest income 318 208 601 384 Interest expense (9,249 ) (7,249 ) (17,790 ) (14,437 ) Other — 3 — 3 Income (loss) before income taxes $ (33,695 ) $ 80,188 $ (17,850 ) $ 131,952 June 30, December 31, 2015 2014 Identifiable assets: Contract drilling $ 3,859,000 $ 4,000,576 Pressure pumping 1,049,778 1,186,010 Oil and natural gas 41,684 50,945 Corporate and other (c) 99,066 156,480 Total assets $ 5,049,528 $ 5,394,011 (a) Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment. (b) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments. (c) Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill by Operating Segment	Goodwill — Goodwill by operating segment as of June 30 , 2015 and changes for the six months then ended are as follows (in thousands): Contract Pressure Drilling Pumping Total Balance December 31, 2014 $ 86,234 $ 124,561 $ 210,795 Changes to goodwill — — — Balance June 30, 2015 $ 86,234 $ 124,561 $ 210,795
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 June 30 , 2015 and December 31, 201 4 (in thousands): June 30, 2015 December 31, 2014 Gross Net Gross Net Carrying Accumulated Carrying Carrying Accumulated Carrying Amount Amortization Amount Amount Amortization Amount Customer relationships $ 25,500 $ (17,303 ) $ 8,197 $ 25,500 $ (15,482 ) $ 10,018

Accrued Expenses (Tables)

Accrued Expenses (Tables)	6 Months Ended
	Jun. 30, 2015
Payables And Accruals [Abstract]
Accrued Expenses	Accrued expenses consisted of the following at June 30 , 2015 and December 31, 2014 (in thousands): June 30, December 31, 2015 2014 Salaries, wages, payroll taxes and benefits $ 32,916 $ 52,956 Workers' compensation liability 75,072 77,348 Property, sales, use and other taxes 9,158 11,644 Insurance, other than workers' compensation 12,082 9,632 Accrued interest payable 7,419 7,427 Other 34,806 14,459 $ 171,453 $ 173,466

Asset Retirement Obligation (Ta

Asset Retirement Obligation (Tables)	6 Months Ended
	Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]
Changes to Company's Asset Retirement Obligations	The following table describes the changes to the Company’s asset retire ment obligations during the six months ended June 30 , 2015 and 2014 (in thousands): Six Months Ended June 30, 2015 2014 Balance at beginning of year $ 5,301 $ 4,837 Liabilities incurred 271 91 Liabilities settled (65 ) (31 ) Accretion expense 86 84 Revision in estimated costs of plugging oil and natural gas wells — 20 Asset retirement obligation at end of period $ 5,593 $ 5,001

Long Term Debt (Tables)

Long Term Debt (Tables)	6 Months Ended
	Jun. 30, 2015
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 by fiscal year as of June 3 0 , 2015 (in thousands): Year ending December 31, 2015 17,500 2016 63,750 2017 191,250 2018 — 2019 — Thereafter 600,000 Total $ 872,500

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Cash Dividends	The Company pai d cash dividends during the six months ended June 30 , 2014 and 201 5 as follows: 2014: Per Share Total (in thousands) Paid on March 27, 2014 $ 0.10 $ 14,456 Paid on June 26, 2014 0.10 14,562 Total cash dividends $ 0.20 $ 29,018 2015: Per Share Total (in thousands) Paid on March 25, 2015 $ 0.10 $ 14,640 Paid on June 24, 2015 0.10 14,712 Total cash dividends $ 0.20 $ 29,352
Treasury Stock Acquisition	Treasury stock acquisitions during the six months ended June 30, 2015 were as follows (dollars in thousands): June 30, 2015 Shares Cost Treasury shares at beginning of period 42,818,585 $ 899,035 Acquisitions pursuant to long-term incentive plans 380,037 7,830 Purchases pursuant to the 2013 buyback program 8,618 180 Treasury shares at end of period 43,207,240 $ 907,045

Fair Values of Financial Inst32

Fair Values of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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 June 30 , 2015 and December 31, 2014 is set forth below (in thousands): June 30, 2015 December 31, 2014 Carrying Fair Carrying Fair Value Value Value Value Borrowings under Credit Agreement: Revolving credit facility $ — $ — $ 303,000 $ 303,000 Term loan facility 77,500 77,500 82,500 82,500 2015 Term Loan 195,000 195,000 — — 4.97% Series A Senior Notes 300,000 310,660 300,000 288,346 4.27% Series B Senior Notes 300,000 294,629 300,000 269,173 Total debt $ 872,500 $ 877,789 $ 985,500 $ 943,019

Calculation of Basic and Dilute

Calculation of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
BASIC EPS:
Net income (loss)	$ (18,975)	$ 54,283	$ (9,850)	$ 89,105
Adjust for (income) loss attributed to holders of non-vested restricted stock	198	(559)	109	(910)
Income (loss) attributed to common stockholders	$ (18,777)	$ 53,724	$ (9,741)	$ 88,195
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	145,300	143,622	145,142	143,259
Basic net income (loss) per common share	$ (0.13)	$ 0.37	$ (0.07)	$ 0.62
DILUTED EPS:
Income (loss) attributed to common stockholders	$ (18,777)	$ 53,724	$ (9,741)	$ 88,195
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	145,300	143,622	145,142	143,259
Add dilutive effect of potential common shares	684	2,407	570	2,327
Weighted average number of diluted common shares outstanding	145,984	146,029	145,712	145,586
Diluted net income (loss) per common share	$ (0.13)	$ 0.37	$ (0.07)	$ 0.61
Potentially dilutive securities excluded as anti-dilutive	5,028	432	5,728	432

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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility	37.91%	35.89%	37.95%	35.89%
Expected term (in years)	5 years	5 years	5 years	5 years
Dividend yield	1.97%	1.21%	2.00%	1.17%
Risk-free interest rate	1.35%	1.76%	1.37%	1.76%

Stock Option Activity (Detail)

Stock Option Activity (Detail) - Jun. 30, 2015 - $ / shares	Total
Underlying Shares
Outstanding at beginning of year	6,086,250
Granted	831,000
Exercised
Cancelled	(10,000)
Expired	(300,000)
Outstanding at end of year	6,607,250
Exercisable at end of year	5,333,927
Weighted Average Exercise Price
Outstanding at beginning of year	$ 22.32
Granted	$ 20.06
Exercised
Cancelled	$ 16.59
Expired	24.63
Outstanding at end of year	21.94
Exercisable at end of year	$ 21.62

Restricted Stock Activity (Deta

Restricted Stock Activity (Detail) - 6 months ended Jun. 30, 2015 - Restricted Stock Awards - $ / shares	Total
Shares
Outstanding at beginning of period	1,493,059
Granted	792,100
Vested	(679,565)
Forfeited	(46,632)
Outstanding at end of period	1,558,962
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	$ 26.93
Granted	20.60
Vested	24.54
Forfeited	26.90
Outstanding at end of period	$ 24.76

Restricted Stock Unit Activity

Restricted Stock Unit Activity (Detail) - 6 months ended Jun. 30, 2015 - Restricted Stock Units (RSUs) - $ / shares	Total
Shares
Outstanding at beginning of period	34,085
Granted	22,100
Vested	(14,499)
Forfeited
Outstanding at end of period	41,686
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	$ 30.20
Granted	20.85
Vested	$ 27.37
Forfeited
Outstanding at end of period	$ 26.22

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) - Performance Units Awards - shares	1 Months Ended	6 Months Ended
	Apr. 30, 2015	Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period		3 years
Award description		Generally, the recipients will receive a target number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 50th percentile and two times the target if at the 75th percentile or higher.
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares		192,000
Shares issued	384,000

Stock-Settled Performance Units

Stock-Settled Performance Units (Detail) - Performance Units Awards	6 Months Ended
	Jun. 30, 2015shares
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
2,011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target number of shares	144,375

Fair Value of Stock Settled Per

Fair Value of Stock Settled Performance Units (Detail) - Performance Units Awards $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
2,015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value at date of grant	$ 4,052
2,014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value at date of grant	5,388
2,013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value at date of grant	5,564
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value at date of grant	3,065
2,011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value at date of grant	$ 5,569

Compensation Expense Associated

Compensation Expense Associated with Stock-Settled Performance Units (Detail) - Performance Units Awards - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
2,015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Stock-Settled Performance Units	$ 338		$ 338
2,014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Stock-Settled Performance Units	449	$ 449	898	$ 449
2,013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Stock-Settled Performance Units	$ 464	464	928	928
2,012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Stock-Settled Performance Units		$ 255	$ 255	510
2,011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense associated with Stock-Settled Performance Units				$ 464

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Equipment	$ 7,025,433	$ 6,679,894
Oil and natural gas properties	199,873	196,234
Buildings	90,029	83,465
Land	22,542	12,038
Property, Plant and Equipment, Gross, Total	7,337,877	6,971,631
Less accumulated depreciation, depletion and impairment	(3,091,730)	(2,840,560)
Property and equipment, net	$ 4,246,147	$ 4,131,071

Business Segments - Additional

Business Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015Segment
Segment Reporting [Abstract]
Number of reportable business segments	3

Business Segments - Income (Los

Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (24,764)	$ 87,226	$ (661)	$ 146,002
Net gain on asset disposals	[1]	2,998	3,091	5,914	4,835
Interest income		318	208	601	384
Interest expense, net of amount capitalized		$ (9,249)	(7,249)	$ (17,790)	(14,437)
Other			3		3
Income (loss) before income taxes		$ (33,695)	80,188	$ (17,850)	131,952
Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(12,949)	98,159	23,611	169,482
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		9,426	69,617	65,564	136,694
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(18,744)	24,910	(33,760)	26,453
Operating Segments | Oil And Natural Gas
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(3,631)	3,632	(8,193)	6,335
Corporate and other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (14,813)	$ (14,024)	$ (30,186)	$ (28,315)
[1]	Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

Business Segments - Revenues (D

Business Segments - Revenues (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		$ 472,761	$ 757,276	$ 1,130,460	$ 1,435,444
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		473,028	758,720	1,131,490	1,437,947
Operating Segments | Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		288,588	440,027	690,829	866,989
Operating Segments | Pressure Pumping
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		176,624	306,577	426,345	546,838
Operating Segments | Oil And Natural Gas
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		7,816	12,116	14,316	24,120
Intersegment Elimination
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues	[1]	$ (267)	$ (1,444)	$ (1,030)	$ (2,503)
[1]	Consists of contract drilling intercompany revenues for services provided to the oil and natural gas exploration and production segment.

Business Segments - Assets (Det

Business Segments - Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]
Assets		$ 5,049,528	$ 5,394,011
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Assets		3,859,000	4,000,576
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Assets		1,049,778	1,186,010
Operating Segments | Oil And Natural Gas
Segment Reporting Asset Reconciling Item [Line Items]
Assets		41,684	50,945
Corporate and other
Segment Reporting Asset Reconciling Item [Line Items]
Assets	[1]	$ 99,066	$ 156,480
[1]	Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

Goodwill by Operating Segment (

Goodwill by Operating Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
Goodwill [Line Items]
Beginning Balance	$ 210,795
Changes to goodwill	0
Ending Balance	210,795
Contract Drilling
Goodwill [Line Items]
Beginning Balance	86,234
Changes to goodwill	0
Ending Balance	86,234
Pressure Pumping
Goodwill [Line Items]
Beginning Balance	124,561
Changes to goodwill	0
Ending Balance	$ 124,561

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Line Items]
Accumulated impairment losses	$ 0		$ 0		$ 0
Customer Relationships
Goodwill And Intangible Assets Disclosure [Line Items]
Amortization period (in years)			7 years
Amortization expense	$ 911,000	$ 911,000	$ 1,800,000	$ 1,800,000

Gross Carrying Amount and Accum

Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - Customer Relationships - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,500	$ 25,500
Accumulated Amortization	(17,303)	(15,482)
Net Carrying Amount	$ 8,197	$ 10,018

Summary of Accrued Expenses (De

Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Salaries, wages, payroll taxes and benefits	$ 32,916	$ 52,956
Workers' compensation liability	75,072	77,348
Property, sales, use and other taxes	9,158	11,644
Insurance, other than workers' compensation	12,082	9,632
Accrued interest payable	7,419	7,427
Other	34,806	14,459
Accrued expenses	$ 171,453	$ 173,466

Changes to Company's Asset Reti

Changes to Company's Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]
Balance at beginning of year	$ 5,301	$ 4,837
Liabilities incurred	271	91
Liabilities settled	(65)	(31)
Accretion expense	$ 86	84
Revision in estimated costs of plugging oil and natural gas wells		20
Asset retirement obligation at end of period	$ 5,593	$ 5,001

Long Term Debt - Additional Inf

Long Term Debt - Additional Information (Detail)

Mar. 18, 2015USD ($)LegalMatter

Mar. 16, 2015

Sep. 27, 2012USD ($)LegalMatter

Jun. 14, 2012USD ($)LegalMatter

Oct. 05, 2010USD ($)LegalMatter

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Oct. 01, 2015

Jul. 01, 2015

Dec. 31, 2014USD ($)

Dec. 24, 2012USD ($)

Debt Instrument [Line Items]

Assets

$ 5,049,528,000

$ 5,049,528,000

$ 5,394,011,000

Letters of credit outstanding

41,300,000

41,300,000

Interest expense related to amortization of debt issuance costs

$ 743,000

$ 547,000

$ 1,300,000

$ 1,100,000

Credit Agreement

Debt Instrument [Line Items]

Aggregate amount by which the revolving credit facility can be increased

$ 100,000,000

Credit facility, maximum borrowing capacity

$ 700,000,000

Debt maturity date

Sep. 27, 2017

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 45%. 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 June 30, 2015

Number of compliance covenants | LegalMatter

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

45.00%

Credit Agreement | Maximum | Subsidiaries

Debt Instrument [Line Items]

Assets

$ 1,000,000

Credit Agreement | London Interbank Offered Rate (LIBOR)

Debt Instrument [Line Items]

Applicable margin

2.75%

2.75%

Credit Agreement | London Interbank Offered Rate (LIBOR) | Scenario, Forecast

Debt Instrument [Line Items]

Applicable margin

2.25%

Credit Agreement | London Interbank Offered Rate (LIBOR) | Subsequent Event

Debt Instrument [Line Items]

Applicable margin

2.25%

Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum

Debt Instrument [Line Items]

Applicable margin

2.25%

Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum

Debt Instrument [Line Items]

Applicable margin

3.25%

Credit Agreement | Base Rate

Debt Instrument [Line Items]

Applicable margin

1.75%

1.75%

Credit Agreement | Base Rate | Scenario, Forecast

Debt Instrument [Line Items]

Applicable margin

1.25%

Credit Agreement | Base Rate | Subsequent Event

Debt Instrument [Line Items]

Applicable margin

1.25%

Credit Agreement | Base Rate | Minimum

Debt Instrument [Line Items]

Applicable margin

1.25%

Credit Agreement | Base Rate | Maximum

Debt Instrument [Line Items]

Applicable margin

2.25%

Reimbursement Agreement

Debt Instrument [Line Items]

Letters of credit outstanding

$ 41,300,000

$ 41,300,000

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 facility, frequency of payment and payment terms

The Term Loan Borrowing is payable in quarterly principal installments, together with accrued interest, on each June 30, September 30, December 31 and March 31, commencing on June 30, 2015. Each of the first four principal installments is in an amount equal to 2.5% of the Term Loan Borrowing and each successive quarterly installment, until and including June 30, 2017, is in an amount equal to 5.0% of the Term Loan Borrowing, with the outstanding principal balance of the Term Loan Borrowing due on the maturity date under the 2015 Term Loan Agreement. The maturity date under the 2015 Term Loan Agreement is September 27, 2017. Loans under the 2015 Term Loan Agreement bear interest, at the Company’s election, at the per annum rate of LIBOR rate plus 3.25% or base rate plus 2.25%.

Line of credit facility, frequency of payments

Quarterly

Commencement date of principal payments

Jun. 30, 2015

Debt maturity date

Sep. 27, 2017

Credit agreement, financial covenant description

The Company must not permit its debt to capitalization ratio to exceed 45%. The 2015 Term Loan 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 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 2015 Term Loan Agreement generally defines the interest coverage ratio as the ratio of EBITDA of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at June 30, 2015.

Number of compliance covenants | LegalMatter

2

Line of credit, amount outstanding

$ 200,000,000

Quarterly interest payment, first payment date

June 30

Quarterly interest payment, second payment date

September 30

Quarterly interest payment, third payment date

December 31

Quarterly interest payment, fourth payment date

March 31

2015 Term Loan Agreement | Subsidiaries

Debt Instrument [Line Items]

Assets

$ 1,000,000

2015 Term Loan Agreement | Minimum

Debt Instrument [Line Items]

Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter

300.00%

2015 Term Loan Agreement | Maximum

Debt Instrument [Line Items]

Debt to capitalization ratio, percentage the Company must not exceed at any time

45.00%

Pro forma ratio of debt to EBITDA

250.00%

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%

2015 Term Loan Agreement | First Four Quarterly Installments

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

2.50%

2015 Term Loan Agreement | Successive Quarterly Installment, Until and Including June 30, 2017

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

5.00%

4.97% Series A Senior Notes, Due October 5th 2020

Debt Instrument [Line Items]

Debt maturity date

Oct. 5, 2020

Number of compliance covenants | LegalMatter

2

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.

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 that same period. The Company was in compliance with these covenants at June 30, 2015.

4.97% Series A Senior Notes, Due October 5th 2020 | Minimum

Debt Instrument [Line Items]

Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter

250.00%

Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium

100.00%

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

Number of compliance covenants | LegalMatter

2

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.

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 that same period. The Company was in compliance with these covenants at June 30, 2015.

4.27% Series B Senior Notes, Due June 14th 2022 | Minimum

Debt Instrument [Line Items]

Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter

250.00%

Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium

100.00%

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%

Reimbursement Agreement and 2015 Term Loan Agreement

Debt Instrument [Line Items]

Debt issuance costs

$ 2,000,000

Revolving Credit Facility

Debt Instrument [Line Items]

Line of credit, amount outstanding

0

0

Line of credit, available borrowing capacity

500,000,000

500,000,000

Revolving Credit Facility | Credit Agreement

Debt Instrument [Line Items]

Current aggregate borrowing capacity

$ 500,000,000

Revolving Credit Facility | Letter of Credit | Credit Agreement

Debt Instrument [Line Items]

Current aggregate borrowing capacity

150,000,000

Revolving Credit Facility | Swing Line Facility | Credit Agreement

Debt Instrument [Line Items]

Current aggregate borrowing capacity

$ 40,000,000

Term Loan Facility

Debt Instrument [Line Items]

Line of credit, amount outstanding

$ 77,500,000

$ 77,500,000

Line of credit facility, interest rate

3.125%

3.125%

Term Loan Facility | Credit Agreement

Debt Instrument [Line Items]

Current aggregate borrowing capacity

$ 100,000,000

Line of credit facility, frequency of payment and payment terms

The term loan facility is payable in quarterly principal installments, which commenced December 27, 2012. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments, 5.00% of the original principal amount for the subsequent four quarterly installments and 13.75% of the original principal amount for the final four quarterly installments.

Line of credit facility, frequency of payments

Quarterly

Commencement date of principal payments

Dec. 27, 2012

Term Loan Facility | Credit Agreement | First Four Quarterly Installments

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

1.25%

Term Loan Facility | Credit Agreement | Subsequent Eight Quarterly Installments

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

2.50%

Term Loan Facility | Credit Agreement | Subsequent Four Quarterly Installments

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

5.00%

Term Loan Facility | Credit Agreement | Amount For The Final Four Quarterly Installments

Debt Instrument [Line Items]

Installment amounts percentage of the original principal amount

13.75%

Schedule of Principal Repayment

Schedule of Principal Repayment Requirements of Long Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2,015	$ 17,500
2,016	63,750
2,017	$ 191,250
2,018
2,019
Thereafter	$ 600,000
Total	$ 872,500	$ 985,500

Commitments Contingencies and O

Commitments Contingencies and Other Matters - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 30, 2015
Commitments and Contingencies Disclosure [Line Items]
Letters of credit, collateral for retrospective premiums and retained losses		$ 41,300,000
Amount drawn under letters of credit		0
Commitments to purchase major equipment		189,000,000
Current obligation		57,900,000
Obligation for remainder of the year		4,400,000
Settlement of fund for eligible participants	$ 12,300,000
Advances to Vendor
Commitments and Contingencies Disclosure [Line Items]
Advance to non-affiliates		$ 12,000,000
Notes receivable interest rate		5.00%
Notes receivable		$ 11,800,000
Repayment of notes receivable		10,400,000
Notes receivable outstanding		$ 1,400,000

Cash Dividends (Detail)

Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jun. 24, 2015	Mar. 25, 2015	Jun. 26, 2014	Mar. 27, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders Equity Note [Line Items]
Cash dividends paid, per share					$ 0.10	$ 0.10	$ 0.20	$ 0.20
Cash dividends paid							$ 29,352
Retained Earnings
Stockholders Equity Note [Line Items]
Cash dividends paid							$ 29,352	$ 29,018
Installment 1, FY 2014
Stockholders Equity Note [Line Items]
Cash dividends paid, date								Mar. 27, 2014
Cash dividends paid, per share				$ 0.10
Installment 1, FY 2014 | Retained Earnings
Stockholders Equity Note [Line Items]
Cash dividends paid								$ 14,456
Installment 2, FY 2014
Stockholders Equity Note [Line Items]
Cash dividends paid, date								Jun. 26, 2014
Cash dividends paid, per share			$ 0.10
Installment 2, FY 2014 | Retained Earnings
Stockholders Equity Note [Line Items]
Cash dividends paid								$ 14,562
Installment 1, FY 2015
Stockholders Equity Note [Line Items]
Cash dividends paid, date							Mar. 25, 2015
Cash dividends paid, per share		$ 0.10
Installment 1, FY 2015 | Retained Earnings
Stockholders Equity Note [Line Items]
Cash dividends paid							$ 14,640
Installment 2, FY 2015
Stockholders Equity Note [Line Items]
Cash dividends paid, date							Jun. 24, 2015
Cash dividends paid, per share	$ 0.10
Installment 2, FY 2015 | Retained Earnings
Stockholders Equity Note [Line Items]
Cash dividends paid							$ 14,712

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Jul. 22, 2015	Jun. 30, 2015	Sep. 06, 2013
Stockholders Equity Note [Line Items]
Remaining Amount approved for repurchases under stock buyback program		$ 187,000,000
2013 Program | Maximum
Stockholders Equity Note [Line Items]
Amount approved for repurchases under stock buyback program			$ 200,000,000
Subsequent Event | Dividend Declared
Stockholders Equity Note [Line Items]
Dividend declaration date	Jul. 22, 2015
Dividend per share, declared	$ 0.10
Dividend payment date	Sep. 24, 2015
Dividend record date	Sep. 10, 2015

Treasury Stock Acquisition (Det

Treasury Stock Acquisition (Detail) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares, Beginning balance	42,818,585
Treasury stock acquired, Shares, Ending balance	43,207,240
Treasury stock acquired, Values, Beginning balance	$ 899,035
Treasury stock acquired, Values	8,010
Treasury stock acquired, Values, Ending balance	$ 907,045
2013 Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares	8,618
Treasury stock acquired, Values	$ 180
Long Term Incentive Plan
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares	380,037
Treasury stock acquired, Values	$ 7,830

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	44.80%	32.50%
Domestic Production Activities Deduction	9.00%

Estimated Fair Value of Outstan

Estimated Fair Value of Outstanding Debt Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	$ 872,500	$ 985,500
Fair value of Debt	877,789	943,019
Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt		303,000
Fair value of Debt		303,000
Term Loan Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	77,500	82,500
Fair value of Debt	77,500	82,500
2015 Term Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	195,000
Fair value of Debt	195,000
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	310,660	288,346
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	$ 294,629	$ 269,173

Fair Values of Financial Inst60

Fair Values of Financial Instruments - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
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	4.21%	5.77%
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	4.58%	6.00%