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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
	Mar. 31, 2016	Mar. 31, 2015
Basic earnings per share:
Net income available to common stockholders	$ 13,659	$ 14,055
Basic weighted-average shares of common stock outstanding	273,780	222,019
Basic earnings per share	$ 0.05	$ 0.06

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.