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Segments (Schedule Of Company's Segment Results) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenues, net	$ 186,932	$ 134,213	$ 504,917	$ 379,431
Operating income	85,834	61,723	231,757	172,102
Depreciation and amortization	13,591	9,052	36,920	26,247
Capital expenditures	5,203	2,492	13,634	8,408
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net	101,495	92,995	291,593	257,444
Operating income	49,273	43,070	140,984	114,387
Depreciation and amortization	5,046	4,990	15,064	14,821
Capital expenditures	1,153	1,142	5,749	3,975
International [Member]
Segment Reporting Information [Line Items]
Revenues, net	85,437	41,218	213,324	121,987
Operating income	36,561	18,653	90,773	57,715
Depreciation and amortization	8,545	4,062	21,856	11,426
Capital expenditures	$ 4,050	$ 1,350	$ 7,885	$ 4,433

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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