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
	Mar. 31, 2015	Mar. 31, 2014
Selected Statements of Comprehensive Loss Data:
Interest expense	$ 20,178	$ 19,704
Loss before income taxes	(70,638)	(79,129)
Benefit from income taxes	(27,040)	(29,912)
Net loss	(43,598)	(49,217)
Loss per share:
Net loss per share, basic	$ (0.51)	$ (0.56)
Net loss per share, diluted	$ (0.51)	$ (0.56)
As Previously Reported [Member]
Selected Statements of Comprehensive Loss Data:
Interest expense		20,046
Loss before income taxes		(79,471)
Benefit from income taxes		(30,040)
Net loss		(49,431)
Loss per share:
Net loss per share, basic		$ (0.56)
Net loss per share, diluted		$ (0.56)
Adjustments [Member]
Selected Statements of Comprehensive Loss Data:
Interest expense		(342)
Loss before income taxes		342
Benefit from income taxes		128
Net loss		214
As Revised [Member]
Selected Statements of Comprehensive Loss Data:
Interest expense		19,704
Loss before income taxes		(79,129)
Benefit from income taxes		(29,912)
Net loss		$ (49,217)
Loss per share:
Net loss per share, basic		$ (0.56)
Net loss per share, diluted		$ (0.56)