Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Share-Based Compensation - Schedule of Restricted Stock Awards (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Restricted Stock at Beginning of Period 10,500
Number of Shares, Restricted Stock Vested (2,500)
Number of shares, Restricted Stock at End of Period 8,000
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock at Beginning of Period $ 10.83
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock Vested $ 10.40
Weighted-Average Grant Date Fair Value Per Share, Restricted Stock at End of Period $ 10.97