Quarterly report pursuant to Section 13 or 15(d)

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

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Share-Based Compensation - Schedule of Restricted Stock Awards under 2013 Plan (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of Shares, Restricted stock at beginning of period 166,332 116,082
Number of Shares, Restricted stock granted 32,720 99,068
Number of Shares, Restricted stock vested (36,331) (51,429)
Number of Shares, Restricted stock forfeited   (1,000)
Number of Shares, Restricted stock at end of period 162,721 162,721
Weighted-Average Grant Date Fair Value Per Share, Restricted stock at beginning of period $ 18.46 $ 16.43
Weighted-Average Grant Date Fair Value Per Share, Restricted stock granted $ 20.86 $ 21.93
Weighted-Average Grant Date Fair Value Per Share, Restricted stock vested $ 16.46 $ 17.53
Weighted-Average Grant Date Fair Value Per Share, Restricted stock forfeited   $ 22.25
Weighted-Average Grant Date Fair Value Per Share, Restricted stock at end of period $ 19.39 $ 19.39