Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 38,679,000		$ 38,679,000		$ 40,406,000
Amortization expense for intangible assets	1,100,000	1,000,000	2,200,000	1,900,000
Estimated amortization expense for the remainder of 2014	2,300,000		2,300,000
Estimated amortization expense for 2015	5,100,000		5,100,000
Estimated amortization expense for 2016	5,200,000		5,200,000
Estimated amortization expense for 2017	5,000,000		5,000,000
Estimated amortization expense for 2018	4,100,000		4,100,000
Domestic Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	16,800,000		16,800,000
International Segment
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 21,800,000		$ 21,800,000