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Per Share Information - Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amounts attributable to common stock:        
Net income from continuing operations $ 73,137 $ 43,176 $ 110,195 $ 122,872
Net income from discontinued operations 605 173,212 605 193,109
Net income attributable to common stock $ 73,742 $ 216,388 $ 110,800 $ 315,981
Weighted average shares:        
Weighted average shares outstanding for basic earnings per share 155,024 188,951 158,090 206,181
Effect of dilutive stock options   10   12
Weighted average shares outstanding for diluted earnings per share 155,024 188,961 158,090 206,193