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Segments (Schedule of Company's Segment Results) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net | $ 202,617 | $ 186,932 | $ 171,820 | $ 146,165 | $ 140,160 | $ 134,213 | $ 134,213 | $ 111,005 | $ 707,534 | $ 519,591 | $ 433,841
Operating income | 93,171 | 85,834 | 81,448 | 64,475 | 54,232 | 61,723 | 59,892 | 50,487 | 324,928 | 226,334 | 170,493
Depreciation and amortization |  |  |  |  |  |  |  |  | 52,036 | 36,171 | 33,745
Capital expenditures |  |  |  |  |  |  |  |  | 19,111 | 13,454 | 11,194
Long-lived assets (excluding goodwill) | 599,907 |  |  |  | 464,165 |  |  |  | 599,907 | 464,165 | 263,469
North America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 400,164 | 348,784 | 287,794
Operating income |  |  |  |  |  |  |  |  | 196,677 | 153,687 | 106,745
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,289 | 19,845 | 20,220
Capital expenditures |  |  |  |  |  |  |  |  | 7,735 | 6,840 | 6,891
Long-lived assets (excluding goodwill) | 152,516 |  |  |  | 113,030 |  |  |  | 152,516 | 113,030 | 113,192
International [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 307,370 | 170,807 | 146,047
Operating income |  |  |  |  |  |  |  |  | 128,251 | 72,647 | 63,748
Depreciation and amortization |  |  |  |  |  |  |  |  | 31,747 | 16,326 | 13,525
Capital expenditures |  |  |  |  |  |  |  |  | 11,376 | 6,614 | 4,303
Long-lived assets (excluding goodwill) | $ 447,391 |  |  |  | $ 351,135 |  |  |  | $ 447,391 | $ 351,135 | $ 150,277

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