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Long-Term Debt - Schedule of Impact of Corrections on Affected Financial Statements (Previously Issued Quarterly Periods) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Summary Quarterly Financial Data:
Total revenues	$ 264,537us-gaap_Revenues	$ 495,834us-gaap_Revenues	$ 405,151us-gaap_Revenues	$ 212,290us-gaap_Revenues	$ 271,959us-gaap_Revenues	$ 538,389us-gaap_Revenues	$ 411,292us-gaap_Revenues	$ 238,610us-gaap_Revenues	$ 1,377,812us-gaap_Revenues	$ 1,460,250us-gaap_Revenues	$ 1,423,752us-gaap_Revenues
Operating expenses									727,659us-gaap_OtherCostAndExpenseOperating	743,322us-gaap_OtherCostAndExpenseOperating	730,582us-gaap_OtherCostAndExpenseOperating
Operating (loss) income	(22,497)us-gaap_OperatingIncomeLoss	161,915us-gaap_OperatingIncomeLoss	80,587us-gaap_OperatingIncomeLoss	(59,408)us-gaap_OperatingIncomeLoss	505us-gaap_OperatingIncomeLoss	205,594us-gaap_OperatingIncomeLoss	27,647us-gaap_OperatingIncomeLoss	(35,873)us-gaap_OperatingIncomeLoss	160,597us-gaap_OperatingIncomeLoss	197,873us-gaap_OperatingIncomeLoss	222,716us-gaap_OperatingIncomeLoss
Interest expense									81,543us-gaap_InterestExpense	90,622us-gaap_InterestExpense	110,565us-gaap_InterestExpense
Loss on early extinguishment of debt and write-off of discounts and deferred financing costs							29,858		461	29,858	2,053
Income (loss) before income taxes									78,791	77,634	111,661
(Benefit from) provision for income taxes									28,872us-gaap_IncomeTaxExpenseBenefit	25,714us-gaap_IncomeTaxExpenseBenefit	37,440us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	(25,446)us-gaap_NetIncomeLoss	87,176us-gaap_NetIncomeLoss	37,406us-gaap_NetIncomeLoss	(49,217)us-gaap_NetIncomeLoss	(12,969)us-gaap_NetIncomeLoss	120,740us-gaap_NetIncomeLoss	(15,900)us-gaap_NetIncomeLoss	(39,951)us-gaap_NetIncomeLoss	49,919us-gaap_NetIncomeLoss	51,920us-gaap_NetIncomeLoss	74,221us-gaap_NetIncomeLoss
(Loss) earnings per share:
Net (loss) income per share, basic	$ (0.29)us-gaap_EarningsPerShareBasic	$ 1.01us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ (0.56)us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic	$ 1.35us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.48)us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic
Net (loss) income per share, diluted	$ (0.29)us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ 0.43us-gaap_EarningsPerShareDiluted	$ (0.56)us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted	$ 1.34us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.48)us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.89us-gaap_EarningsPerShareDiluted
As Previously Reported [Member]
Selected Summary Quarterly Financial Data:
Total revenues	271,959	538,389	405,151	212,290			411,292	238,610
Operating expenses	169,430	202,625	189,190	167,912			194,674	173,260		739,989	726,509
Operating (loss) income	505	205,594	80,587	(59,408)			30,980	(35,873)
Interest expense	20,986	21,018	20,638	20,046			22,926	28,606		93,536	111,426
Loss on early extinguishment of debt and write-off of discounts and deferred financing costs							32,429			32,429
Income (loss) before income taxes	(20,433)	184,589	59,994	(79,471)			(24,268)	(64,406)		75,482	116,926
(Benefit from) provision for income taxes	(6,926)	64,390	22,658	(30,040)			(8,414)	(24,046)		25,004	39,482
Net (loss) income	(13,507)	120,199	37,336	(49,431)			(15,854)	(40,360)		50,478	77,444
(Loss) earnings per share:
Net (loss) income per share, basic	$ (0.15)	$ 1.34	$ 0.43	$ (0.56)			$ (0.18)	$ (0.49)		$ 0.58	$ 0.94
Net (loss) income per share, diluted	$ (0.15)	$ 1.33	$ 0.43	$ (0.56)			$ (0.18)	$ (0.49)		$ 0.57	$ 0.93
Adjustments [Member]
Selected Summary Quarterly Financial Data:
Operating expenses							3,333			3,333	4,073
Operating (loss) income							(3,333)
Interest expense	(803)	(807)	(112)	(342)			(694)	(610)		(2,914)	(861)
Loss on early extinguishment of debt and write-off of discounts and deferred financing costs							(2,571)			(2,571)	2,053
Income (loss) before income taxes	803	807	112	342			(68)	610		2,152	(5,265)
(Benefit from) provision for income taxes	265	266	42	128			(22)	201		710	(2,042)
Net (loss) income	538	541	70	214			(46)	409		1,442	(3,223)
(Loss) earnings per share:
Net (loss) income per share, basic	$ 0.01	$ 0.01						$ 0.01		$ 0.01	$ (0.04)
Net (loss) income per share, diluted	$ 0.01	$ 0.01						$ 0.01		$ 0.02	$ (0.04)
Scenario as Revised [Member]
Selected Summary Quarterly Financial Data:
Total revenues	271,959	538,389	405,151	212,290			411,292	238,610
Operating expenses	169,430	202,625	189,190	167,912			198,007	173,260		743,322	730,582
Operating (loss) income	505	205,594	80,587	(59,408)			27,647	(35,873)
Interest expense	20,183	20,211	20,526	19,704			22,232	27,996		90,622	110,565
Loss on early extinguishment of debt and write-off of discounts and deferred financing costs							29,858			29,858	2,053
Income (loss) before income taxes	(19,630)	185,396	60,106	(79,129)			(24,336)	(63,796)		77,634	111,661
(Benefit from) provision for income taxes	(6,661)	64,656	22,700	(29,912)			(8,436)	(23,845)		25,714	37,440
Net (loss) income	$ (12,969)	$ 120,740	$ 37,406	$ (49,217)			$ (15,900)	$ (39,951)		$ 51,920	$ 74,221
(Loss) earnings per share:
Net (loss) income per share, basic	$ (0.14)	$ 1.35	$ 0.43	$ (0.56)			$ (0.18)	$ (0.48)		$ 0.59	$ 0.90
Net (loss) income per share, diluted	$ (0.14)	$ 1.34	$ 0.43	$ (0.56)			$ (0.18)	$ (0.48)		$ 0.59	$ 0.89