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Shared-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Share-based compensation expense $ 573 $ 510 $ 1,666 $ 1,394
Number of Options, Granted     354 285
Shares granted other than options     95 78
Expenses related to issuance of restricted stock     606 608
Vesting period     3 years 3 years
Stock or Unit Option Plan Expense     $ 1,060 $ 786