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Common Stock - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended 192 Months Ended 264 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]          
Common shares outstanding 3,891 4,049   3,891 3,891
Treasury stock repurchases, shares 290 508 581   24,100
Treasury stock repurchases, value $ 431,367 $ 567,544 $ 554,491   $ 6,307,000
Reissued shares during the period, shares 131 123 102 7,418