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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

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