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Operating Segment Information (Detail) - (Table 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting [Abstract] |  |
Domestic | $ 252,437 | $ 252,365
International | 26,479 | 13,605
Total | $ 278,916 | $ 265,970

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