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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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic earnings per share:
Net income available to common stockholders	$ 9,347	$ 7,601	$ 23,402	$ 15,609
Basic weighted-average shares of common stock outstanding	244,862	220,770	233,504	220,689
Basic earnings per share	$ 0.04	$ 0.03	$ 0.10	$ 0.07

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.