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Quarterly Financial Data - Results of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Revenues | $ 214,327 | $ 184,710 | $ 149,063 | $ 138,566 | $ 116,876 | $ 87,596 | $ 67,206 | $ 58,744 | $ 686,668 | $ 330,422 | $ 128,927
Operating income | 86,619 | 72,038 | 60,184 | 58,152 | 54,336 | 40,273 | 32,414 | 25,544 | 276,993 | 152,567 | 21,993
Net income (loss) | $ 42,591 | $ 18,314 | $ 76,041 | $ 16,442 | $ (13,401) | $ 66,289 | $ 33,349 | $ (6,847) | $ 153,388 | $ 79,390 | $ (29,695)

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