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Revolving Credit Facility - Additional Information (Detail) - USD ($)
Nov. 04, 2013
Jun. 30, 2015
Nov. 05, 2014
Line of Credit Facility [Line Items]      
Credit facility initiation date Nov. 04, 2013    
Revolving credit facility amount $ 20,000,000    
Credit facility fee percentage 0.20%    
Line of Credit Facility, Expiration Period 3 years    
Debt outstanding   $ 0  
Stock Repurchase Plan [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility amount     $ 30,000,000
Minimum [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest rate 1.375%    
Maximum [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest rate 2.00%