Stock and Incentive Compensation Plans - Summary of Restricted Stock and Restricted Stock Units (Detail) - Restricted Stock and Restricted Stock Units [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Beginning Balance, Shares	1,404	1,808	2,166
Granted	591	477	605
Restricted stock vested	(781)	(862)	(947)
Forfeited	(116)	(19)	(16)
Restricted Stock Ending Balance, Shares	1,098	1,404	1,808
Restricted stock and restricted stock units vested at December 31, 2015	197
Restricted Stock Beginning Balance, Weighted Average Grant Date Fair Value	$ 2.44	$ 1.48	$ 0.92
Granted, Weighted Average Grant Date Fair Value	3.24	3.64	2.35
Restricted stock vested, Weighted Average Grant Date Fair Value	2.03	1.13	0.75
Forfeited, Weighted Average Grant Date Fair Value	3.45	1.37	1.09
Restricted Stock Ending Balance, Weighted Average Grant Date Fair Value	3.16	$ 2.44	$ 1.48
Restricted stock and restricted stock units vested, Weighted Average Grant Date Fair Value	$ 2.86
Restricted Stock Outstanding, Average Remaining Contractual Term (Years)	8 years 1 month 6 days
Restricted Outstanding, Aggregate Intrinsic Value	$ 4,090
Restricted stock and restricted stock units vested, Aggregate Intrinsic Value	$ 733
Restricted Stock Outstanding, Average Remaining Vesting Period (months)	5 years 3 months 18 days
Restricted Stock Outstanding, Unrecognized Compensation Expense	$ 1,520