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Share-Based Compensation - Summary of Status of Non-vested, Restricted and Performance Shares (Detail) (Restricted and Performance Shares [Member], USD $)
12 Months Ended
Dec. 31, 2013
Restricted and Performance Shares [Member]
 
Schedule Of Nonvested Restricted Stock Units Activities [Line Items]  
Non-vested beginning of year, Shares 76,003
Vested, Shares   
Granted, Shares 9,872
Forfeited, Shares   
Non-vested, end of year, Shares 85,875
Non-vested beginning of year, Weighted Average Grant Date Fair Value $ 13.38
Vested, Weighted Average Grant Date Fair Value   
Granted, Weighted Average Grant Date Fair Value $ 20.24
Forfeited, Weighted Average Grant Date Fair Value   
Non-vested end of year, Weighted Average Grant Date Fair Value $ 14.17