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Stock-Based Compensation - Summary of Outstanding Restricted Stock Awards and Related Activity (Detail) (Restricted stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 1,319 1,355 1,604
Number of shares, Granted 1,495 995 1,000
Number of shares, Vested (752) (611) (823)
Number of shares, Cancelled and forfeited (316) (420) (426)
Number of shares, ending balance 1,746 1,319 1,355
Weighted average grant date fair value, beginning balance $ 4.60 $ 3.21 $ 7.23
Weighted average grant date fair value, Granted $ 1.70 $ 2.64 $ 8.86
Weighted average grant date fair value, Vested $ 4.43 $ 6.42 $ 7.40
Weighted average grant date fair value, Cancelled and forfeited $ 3.00 $ 8.73 $ 7.81
Weighted average grant date fair value, ending balance $ 2.48 $ 4.60 $ 3.21