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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic earnings (loss) per share:
Net income (loss) available to common stockholders	$ 118,864	$ 81,529	$ 212,677	$ 171,274
Basic weighted-average shares of common stock outstanding	327,932	288,308	319,027	286,200
Basic earnings (loss) per share	$ 0.36	$ 0.28	$ 0.67	$ 0.60

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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