Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 98,084		$ 98,084		$ 108,593
Amortization expense for intangible assets	2,400	$ 1,100	7,200	$ 3,400
Estimated amortization expense for the remainder of 2015	2,600		2,600
Estimated amortization expense for 2016	10,100		10,100
Estimated amortization expense for 2017	10,000		10,000
Estimated amortization expense for 2018	9,400		9,400
Estimated amortization expense for 2019	9,200		9,200
Estimated amortization expense for 2020	9,200		9,200
Domestic Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	61,600		61,600
International Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 36,500		$ 36,500