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Stock-based Payment Arrangements - Unvested Restricted Stock Activity (Detail) (Restricted Stock [Member], Recognition and Retention Plan [Member], USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock [Member] | Recognition and Retention Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 144,840
Granted, Number of Shares 8,000
Forfeited, Number of Shares (3,900)
Released, Number of Shares (68,920)
Number of Shares, Ending Balance 80,020
Weighted-Average Grant Date Fair Value, Beginning Balance $ 11.83
Granted, Weighted-Average Grant Date Fair Value $ 17.54
Forfeited, Weighted-Average Grant Date Fair Value $ 15.50
Released, Weighted-Average Grant Date Fair Value $ 11.63
Weighted-Average Grant Date Fair Value, Ending Balance $ 12.39