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Line of Credit Facility - Additional Information (Detail) (Amended and Restated Line, USD $)
0 Months Ended
Mar. 27, 2014
Oct. 31, 2014
Mar. 27, 2014
Line of Credit Facility [Line Items]      
Line of credit facility     $ 175,000,000
Line of credit facility, period 5 years    
Additional line of credit borrowing, amount     50,000,000
Outstanding letters of credit and stand-by letters of credit   74,974,000  
Available credit including accordion feature   $ 100,026,000  
Minimum
     
Line of Credit Facility [Line Items]      
Interest rate on cash advances in addition to LIBOR 0.50%    
Maximum
     
Line of Credit Facility [Line Items]      
Interest rate on cash advances in addition to LIBOR 1.50%