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Share-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Compensation Related Costs [Abstract]        
Recognized share-based compensation awards $ 215 $ 174 $ 373 $ 328