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Credit Facility - Additional Information (Detail) (Revolving Credit Facility, USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Mar. 05, 2013
Mar. 05, 2013
LIBOR
Line Of Credit Facility [Line Items]        
Credit facility, maximum borrowing capacity     $ 15.0  
Credit facility, maturity term 3 years      
Credit facility, interest rate       3.25%
Revolving credit facility outstanding $ 0 $ 0