Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 100,904		$ 100,904		$ 108,593
Amortization expense for intangible assets	2,400	$ 1,100	4,900	$ 2,200
Estimated amortization expense for the remainder of 2015	5,000		5,000
Estimated amortization expense for 2016	10,200		10,200
Estimated amortization expense for 2017	10,000		10,000
Estimated amortization expense for 2018	9,400		9,400
Estimated amortization expense for 2019	9,300		9,300
Estimated amortization expense for 2020	9,300		9,300
Domestic Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	63,200		63,200
International Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 37,700		$ 37,700