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Common Stock - Share Repurchase of Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended | 264 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Statement Of Stockholders Equity [Abstract] |  |  |  |
Aggregate purchase price | $ 431,367 | $ 567,544 | $ 554,491 | $ 6,307,000
Number of shares repurchased | 290 | 508 | 581 | 24,100

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