Long-Term Debt - Schedule of Impact of Corrections on Affected Financial Statements (Previously Issued Quarterly Periods) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Selected Statements of Comprehensive Income (Loss) Data:
Interest expense	$ 15,732	$ 20,526	$ 35,910	$ 40,230
Income (loss) before income taxes	9,461	60,106	(61,177)	(19,023)
Provision for (benefit from) income taxes	3,652	22,700	(23,388)	(7,212)
Net income (loss)	$ 5,809	$ 37,406	$ (37,789)	$ (11,811)
Net income (loss) per share:
Net income (loss) per share, basic	$ 0.07	$ 0.43	$ (0.44)	$ (0.13)
Net income (loss) per share, diluted	$ 0.07	$ 0.43	$ (0.44)	$ (0.13)
As Previously Reported [Member]
Selected Statements of Comprehensive Income (Loss) Data:
Interest expense		$ 20,638		$ 40,684
Income (loss) before income taxes		59,994		(19,477)
Provision for (benefit from) income taxes		22,658		(7,382)
Net income (loss)		$ 37,336		$ (12,095)
Net income (loss) per share:
Net income (loss) per share, basic		$ 0.43		$ (0.14)
Net income (loss) per share, diluted		$ 0.43		$ (0.14)
Adjustments [Member]
Selected Statements of Comprehensive Income (Loss) Data:
Interest expense		$ (112)		$ (454)
Income (loss) before income taxes		112		454
Provision for (benefit from) income taxes		42		170
Net income (loss)		70		$ 284
Net income (loss) per share:
Net income (loss) per share, basic				$ (0.01)
Net income (loss) per share, diluted				$ (0.01)
As Revised [Member]
Selected Statements of Comprehensive Income (Loss) Data:
Interest expense		20,526		$ 40,230
Income (loss) before income taxes		60,106		(19,023)
Provision for (benefit from) income taxes		22,700		(7,212)
Net income (loss)		$ 37,406		$ (11,811)
Net income (loss) per share:
Net income (loss) per share, basic		$ 0.43		$ (0.13)
Net income (loss) per share, diluted		$ 0.43		$ (0.13)