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Segments - Schedule of Company's Segment Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenues, net	$ 220,869	$ 171,820	$ 414,520	$ 317,985
Operating income	109,074	81,448	203,327	145,923
Depreciation and amortization	15,890	11,609	30,519	23,329
Capital expenditures	5,346	4,868	10,108	8,431
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net	119,486	107,286	220,080	190,098
Operating income	60,103	53,598	109,529	91,711
Depreciation and amortization	5,267	5,024	10,439	10,018
Capital expenditures	1,292	2,501	2,356	4,596
International [Member]
Segment Reporting Information [Line Items]
Revenues, net	101,383	64,534	194,440	127,887
Operating income	48,971	27,850	93,798	54,212
Depreciation and amortization	10,623	6,585	20,080	13,311
Capital expenditures	$ 4,054	$ 2,367	$ 7,752	$ 3,835

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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