XML 20 R28.htm IDEA: XBRL DOCUMENT v2.4.0.8
Line of Credit Facility - Additional Information (Detail) (Amended and Restated Line, USD $)
 0 Months Ended
Mar. 27, 2014
Apr. 30, 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   85,974,000
Available credit including accordion feature   $ 89,026,000
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%