Common Stock and Earnings (Loss) Per Share (As Restated) - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings (Loss) Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic earnings (loss) per share
Net income (loss) available to common stockholders (numerator)	$ 4,508	$ (172,702)
Weighted-average common shares outstanding (denominator)	36,412	35,579
Basic earnings (loss) per common and common equivalent share	$ 0.12	$ (4.85)
Diluted earnings (loss) per share
Net income (loss) available to common stockholders (numerator)	$ 4,508	$ (172,702)
Diluted weighted-average common shares outstanding (denominator)	36,812	35,579
Diluted earnings (loss) per common and common equivalent share	$ 0.12	$ (4.85)