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