Segments - Schedule of Company's Segment Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues, net	$ 273,502	$ 220,869	$ 527,410	$ 414,520
Operating income	134,484	109,074	248,620	203,327
Depreciation and amortization	24,429	15,890	48,847	30,519
Capital expenditures	5,968	5,346	11,552	10,108
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net	138,861	119,486	265,236	220,080
Operating income	68,317	60,103	124,514	109,529
Depreciation and amortization	6,376	5,267	13,012	10,439
Capital expenditures	1,840	1,292	3,836	2,356
International [Member]
Segment Reporting Information [Line Items]
Revenues, net	134,641	101,383	262,174	194,440
Operating income	66,167	48,971	124,106	93,798
Depreciation and amortization	18,053	10,623	35,835	20,080
Capital expenditures	$ 4,128	$ 4,054	$ 7,716	$ 7,752