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Per Share Information - Basic and Diluted Earnings Per Share Attributable to Common Stock (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amounts attributable to common stock:        
Net income from continuing operations $ 89,313 $ 73,137 $ 201,417 $ 110,195
Net income from discontinued operations 0 605 0 605
Net income attributable to common stock $ 89,313 $ 73,742 $ 201,417 $ 110,800
Weighted average shares:        
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) 157,484 155,024 155,796 158,090
Effect of dilutive unvested non-participating stock-based awards (in shares) 1,136 0 997 0
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) 158,620 155,024 156,793 158,090