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Operating Segment Information (Detail) - (Table 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 15 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Segment Reporting [Abstract]        
Domestic $ 327,965 $ 847,020 $ 650,408 $ 297,873
International 28,918 64,525 38,386 16,014
Total $ 356,883 $ 911,545 $ 688,794 $ 313,887