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Shared-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 661 $ 573 $ 1,948 $ 1,666
Number of options granted     98 354
Shares granted other than options     98 95
Expenses related to issuance of restricted stock     951 606
Vesting period of stock issue     3 years 3 years
Stock or unit option plan expense     $ 997 $ 1,060