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Shared-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Share-based compensation expense $ 714 $ 664 $ 1,286 $ 1,094
Number of options granted     98 354
Shares granted other than options     97 95
Expenses related to issuance of restricted stock     575 411
Vesting period of stock issue     3 years 3 years
Stock or unit option plan expense     $ 711 $ 683