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Share-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
Compensation Related Costs [Abstract]        
Recognized share-based compensation awards $ 283 $ 165 $ 656 $ 493