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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Amounts attributable to common stock: |  |  |  |
Net income attributable to common stock | $ 124,551 | $ 89,313 | $ 236,530 | $ 201,417
Weighted average shares: |  |  |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) | 152,562 | 157,484 | 154,087 | 155,796
Effect of dilutive unvested non-participating stock-based awards (in shares) | 1,125 | 1,136 | 1,111 | 997
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) | 153,687 | 158,620 | 155,198 | 156,793

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