XML 26 R57.htm IDEA: XBRL DOCUMENT v3.3.0.814
Revolving Credit Facility - Additional Information (Detail) - USD ($)
Nov. 04, 2013
Nov. 20, 2015
Sep. 30, 2015
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
Subsequent Event [Member] | 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%