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Summary of Non-Vested Shares (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning balance 245,817
Number of Shares, Granted 162,336
Number of Shares, Vested (19,452)
Number of Shares, Forfeited (11,999)
Number of Shares, Ending Balance 376,702
Weighted Average Grant-Date Fair Value, Beginning balance $ 20.23
Weighted Average Grant-Date Fair Value, Granted $ 30.91
Weighted Average Grant-Date Fair Value, Vested $ 18.38
Weighted Average Grant-Date Fair Value, Forfeited $ 22.75
Weighted Average Grant-Date Fair Value, Ending balance $ 24.85