Annual report pursuant to Section 13 and 15(d)

Share-Based Compensations - Schedule of Restricted Stock Awards under 2013 Plan (Detail)

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Share-Based Compensations - Schedule of Restricted Stock Awards under 2013 Plan (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Restricted stock at beginning of period 10,500 19,725 18,200
Number of Shares, Restricted stock granted 116,332   10,000
Number of Shares, Restricted stock vested (7,000) (7,225) (8,475)
Number of Shares, Restricted stock forfeited (3,750) (2,000)  
Number of Shares, Restricted stock at end of period 116,082 10,500 19,725
Weighted-Average Grant Date Fair Value Per Share, Restricted stock at beginning of period $ 10.83 $ 11.66 $ 14.38
Weighted-Average Grant Date Fair Value Per Share, Restricted stock granted $ 16.55    $ 9.88
Weighted-Average Grant Date Fair Value Per Share, Restricted stock vested $ 10.75 $ 13.78 $ 15.41
Weighted-Average Grant Date Fair Value Per Share, Restricted stock forfeited $ 15.30 $ 8.32   
Weighted-Average Grant Date Fair Value Per Share, Restricted stock at end of period $ 16.43 $ 10.83 $ 11.66