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Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Equity [Abstract]      
Other comprehensive income $ 0 $ 0  
Accumulated other comprehensive income $ (2,608) $ (2,608) $ 0