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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic earnings per share:
Net income available to common stockholders	$ 126,788	$ 4,135	$ 70,924
Basic weighted-average shares of common stock outstanding	243,460	220,697	193,694
Basic earnings per share	$ 0.52	$ 0.02	$ 0.37

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

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.