Description of the Business and Basis of Presentation - Schedule of Impact of Corrections on Affected Condensed Consolidated Balance Sheet Line Items (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Selected Balance Sheet Data:
Other assets	$ 32,956	$ 35,890
Total assets	2,531,417	2,577,410
Long-term debt	1,592,369	1,632,531
Deferred tax liabilities, net	50,230	25,670
Retained earnings	58,962	1,886
Total stockholders' equity	620,117	648,027
Total liabilities and stockholders' equity	2,531,417	2,577,410
As Previously Reported [Member]
Selected Balance Sheet Data:
Other assets		40,753
Total assets		2,582,273
Long-term debt		1,627,183
Deferred tax liabilities, net		29,776
Retained earnings		7,991
Total stockholders' equity		654,132
Total liabilities and stockholders' equity		2,582,273
Adjustments [Member]
Selected Balance Sheet Data:
Other assets		(4,863)
Total assets		(4,863)
Long-term debt		5,348
Deferred tax liabilities, net		(4,106)
Retained earnings		(6,105)
Total stockholders' equity		(6,105)
Total liabilities and stockholders' equity		$ (4,863)