Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2011	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying value of goodwill	$ 2,200,000			$ 2,200,000
Accumulated impairment of goodwill	2,100,000			2,100,000
Goodwill impairment charge						$ 2,100,000
Goodwill	86,841			86,841			$ 86,841
Income tax benefit	(14,197)		$ 803	17,562	$ 18,253
Amortization expense on intangible assets	$ 6,401		$ 714	$ 15,313	$ 2,175
Trademarks
Finite-Lived Intangible Assets [Line Items]
Income tax benefit		$ 41,200
Remaining amortization period				5 years