Stock-Based Compensation Plans - Summary of the Activity for the Company's Stock Option Awards (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Options, Beginning Balance	1,237,000	1,595,000	4,500,000
Granted, Options	0	0	825,000
Forfeited, Options	(117,000)	(358,000)	(3,730,000)
Options outstanding, Options, Ending Balance	1,120,000	1,237,000	1,595,000
Options exercisable/vested at December 31, 2014	940,000
Granted, Exercise Price			$ 1.45
Forfeited, Exercise Price	$ 5.22	$ 3.04
Options outstanding, Weighted Average Exercise Price, Beginning Balance	$ 2.19	$ 2.38	$ 3.06
Granted, Weighted Average Exercise Price			$ 1.45
Forfeited, Weighted Average Exercise Price	$ 5.22	$ 3.04	$ 3.00
Options outstanding, Weighted Average Exercise Price, Ending Balance	$ 1.87	$ 2.19	$ 2.38
Options exercisable/vested at December 31, 2014, Weighted Average Exercise Price	$ 1.95
Options outstanding, Aggregate Intrinsic Value, Ending balance	$ 908
Options exercisable/vested at December 31, 2014, Aggregate Intrinsic Value	$ 710
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Exercise Price, Beginning Balance			$ 3.00
Forfeited, Exercise Price			$ 3.00
Options Outstanding, Exercise Price, Ending Balance	$ 1.45	$ 1.45	$ 1.45
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Exercise Price, Beginning Balance			$ 8.13
Forfeited, Exercise Price			$ 3.04
Options Outstanding, Exercise Price, Ending Balance	$ 3.04	$ 8.13	$ 8.13