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Per Share Information - Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amounts attributable to common stock:                      
Net income from continuing operations $ (2,586) $ 43,176 $ 32,007 $ 47,689 $ 60,406 $ 87,923 $ 73,453 $ 47,442 $ 120,286 $ 269,224 $ 372,057
Net income from discontinued operations                 190,621 27,490 29,864
Net income attributable to common stock $ (5,074) $ 216,388 $ 46,109 $ 53,484 $ 66,576 $ 94,648 $ 81,082 $ 54,408 $ 310,907 $ 296,714 $ 401,921
Weighted average shares:                      
Weighted average shares outstanding for basic earnings per share                 195,113 219,668 214,929
Effect of dilutive stock options                 7 22 49
Weighted average shares outstanding for diluted earnings per share                 195,120 219,690 214,978