Earnings (Loss) Per Share - Schedule of Earnings (Loss) per Share Basic and Diluted (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings (losses):
Net income (loss) available to common shareholders	$ (10,110)	$ 4,936	$ (37,645)	$ (32,806)
Shares:
Weighted average common shares outstanding	48,770	37,270	41,693	37,270
Dilutive effect of restricted stock units
Diluted weighted average shares outstanding	48,770	37,270	41,693	37,270
Income (loss) per share:
Income (loss) per share-basic and diluted	$ (0.21)	$ 0.13	$ (0.90)	$ (0.88)