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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