Annual report pursuant to Section 13 and 15(d)

Summary of Share Activity Related to Restricted Stock (Detail)

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Summary of Share Activity Related to Restricted Stock (Detail) (Restricted Stock, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares, Nonvested, beginning of period 43,687 51,870 470,392
Shares, Granted 27,450 21,954 20,433
Shares, Vested (27,297) (27,475) (404,422)
Shares, Forfeited   (2,662) (34,533)
Shares, Nonvested, end of period 43,840 43,687 51,870
Weighted Average Grant Date Value Per Share, Beginning of period $ 18.69 $ 15.81 $ 7.42
Weighted Average Grant Date Fair Value Per Share, Granted $ 12.75 $ 19.13 $ 25.45
Weighted Average Grant Date Fair Value Per Share, Vested $ 17.09 $ 13.59 $ 7.31
Weighted Average Grant Date Fair Value Per Share, Forfeited   $ 18.78 $ 6.83
Weighted Average Grant Date Value Per Share, End of period $ 15.96 $ 18.69 $ 15.81