Stockholders' Equity - Schedule of Changes in Stockholders' Deficit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Line Items]
Beginning balance,amount			$ (185,289)
Net income	$ 7,350	$ (24,423)	17,673	$ (24,048)
Other comprehensive income			256
Stock-based compensation			992
Ending balance,amount	(166,368)		(166,368)
Common Stock [Member]
Equity [Line Items]
Beginning balance,amount			$ 303
Beginning balance,shares			30,364,501
Vesting of restricted stock awards			20,936
Ending balance,amount	$ 303		$ 303
Ending balance,shares	30,385,437		30,385,437
Additional Paid-In Capital [Member]
Equity [Line Items]
Beginning balance,amount			$ 175,553
Stock-based compensation			992
Ending balance,amount	$ 176,545		176,545
Accumulated Deficit [Member]
Equity [Line Items]
Beginning balance,amount			(359,160)
Net income			17,673
Ending balance,amount	(341,487)		(341,487)
Accumulated Other Comprehensive Loss [Member]
Equity [Line Items]
Beginning balance,amount			(1,985)
Other comprehensive income			256
Ending balance,amount	$ (1,729)		$ (1,729)