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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Disclosure Quarterly Financial Data Results Of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 333,615 | $ 305,498 | $ 254,582 | $ 248,304 | $ 214,327 | $ 184,710 | $ 149,063 | $ 138,566 | $ 1,141,999 | $ 686,668 | $ 330,422
Operating income | 122,133 | 150,862 | 113,450 | 117,953 | 86,619 | 72,038 | 60,184 | 58,152 | 504,398 | 276,993 | 152,567
Net income | $ 54,490 | $ 54,499 | $ 67,119 | $ 51,851 | $ 42,591 | $ 18,314 | $ 76,041 | $ 16,442 | $ 227,959 | $ 153,388 | $ 79,390

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