Segments - Schedule of Company's Segment Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues, net	$ 253,908	$ 193,651
Operating income	114,136	94,253
Depreciation and amortization	24,418	14,629
Capital expenditures	5,584	4,762
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net	126,375	100,594
Operating income	56,197	49,426
Depreciation and amortization	6,636	5,172
Capital expenditures	1,996	1,064
International [Member]
Segment Reporting Information [Line Items]
Revenues, net	127,533	93,057
Operating income	57,939	44,827
Depreciation and amortization	17,782	9,457
Capital expenditures	$ 3,588	$ 3,698