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Shared-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Share-based compensation expense $ 539 $ 430
Number of Options, Granted 96  
Shares granted other than options 93  
Expenses related to issuance of restricted stock 162 163
Vesting period of stock issue 3 years 3 years
Stock or Unit Option Plan Expense $ 377 $ 267