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Segments - Schedule of Company's Segment Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues, net	$ 193,651	$ 146,165
Operating income	94,253	64,475
Depreciation and amortization	14,629	11,720
Capital expenditures	4,762	3,563
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net	100,594	82,812
Operating income	49,426	38,113
Depreciation and amortization	5,172	4,994
Capital expenditures	1,064	2,095
International [Member]
Segment Reporting Information [Line Items]
Revenues, net	93,057	63,353
Operating income	44,827	26,362
Depreciation and amortization	9,457	6,726
Capital expenditures	$ 3,698	$ 1,468

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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