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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
1 Months Ended
Mar. 31, 2015
Subsequent Events [Abstract]  
Shares repurchased 113us-gaap_StockRepurchasedDuringPeriodShares
Shares repurchased, value $ 1.0us-gaap_StockRepurchasedDuringPeriodValue