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Per Share Information - Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts attributable to common stock:                      
Net income from continuing operations $ 113,561 $ 89,313 $ 63,837 $ 48,267 $ 88,530 $ 73,137 $ 16,562 $ 20,496 $ 314,978 $ 198,725 $ 120,286
Net income (loss) from discontinued operations                 0 (342) 190,621
Net income attributable to common stock $ 113,561 $ 89,313 $ 63,837 $ 48,267 $ 87,583 $ 73,742 $ 16,562 $ 20,496 $ 314,978 $ 198,383 $ 310,907
Weighted average shares:                      
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares)                 156,124,000 157,287,000 195,113,000
Effect of dilutive unvested non-participating stock-based awards (in shares)                 1,031,000 1,000 7,000
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)                 157,155,000 157,288,000 195,120,000
Number of shares of Common stock received for each exchangeable share (in shares)                 1