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Revolving Credit Facility - Additional Information (Detail) (USD $)
0 Months Ended 0 Months Ended
Nov. 04, 2013
Sep. 30, 2014
Nov. 05, 2014
Subsequent Event [Member]
Stock Repurchase Plan [Member]
Nov. 04, 2013
Minimum [Member]
Nov. 04, 2013
Maximum [Member]
Line of Credit Facility [Line Items]          
Credit facility initiation date Nov. 04, 2013        
Revolving credit facility amount $ 20,000,000   $ 30,000,000    
Credit facility interest rate       1.375% 2.00%
Credit facility fee percentage 0.20%        
Line of Credit Facility, Expiration Period 3 years        
Debt outstanding   $ 0