Net Income (Loss) Per Share - Summary of Net Income (Loss) Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Weighted average shares outstanding									19,794	16,012	12,956
Less: restricted stock issued									(254)	(251)	(149)
Basic divisor									19,540	15,761	12,807
Dilutive shares:
Restricted stock awards									239	138
Stock options									272	187
Diluted divisor									20,051	16,086	12,807
Net income (loss)	$ 3,850	$ 1,009	$ 6,677	$ (5,783)	$ 91,645	$ 233	$ 1,198	$ 3,232	$ 5,753	$ 96,308	$ (7,710)
Net income (loss) per share:
Basic	$ 0.17	$ 0.05	$ 0.38	$ (0.33)	$ 5.31	$ 0.01	$ 0.07	$ 0.25	$ 0.29	$ 6.11	$ (0.60)
Diluted	$ 0.16	$ 0.05	$ 0.37	$ (0.33)	$ 5.20	$ 0.01	$ 0.07	$ 0.25	$ 0.29	$ 5.99	$ (0.60)