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Earnings Per Share - Calculation of Fully Diluted Earnings Per Share from Discontinued Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fully diluted earnings (loss) per share:
Net income (loss) from discontinued operations available to common stockholders		$ 120,438	$ 176,278
Weighted-average shares:
Common stock outstanding	344,332	322,141	287,378
Discontinued Operations [Member]
Fully diluted earnings (loss) per share:
Net income (loss) from discontinued operations available to common stockholders		$ 120,438	$ 176,278
Net income (loss) for fully diluted shares		$ 120,438	$ 176,278
Weighted-average shares:
Common stock outstanding		322,141	287,378
RSUs (Treasury stock method)		368
Other		1,335
Fully diluted weighted-average shares of common stock outstanding		323,844	287,378
Fully diluted earnings (loss) per share from discontinued operations		$ 0.37	$ 0.61

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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