Annual report pursuant to Section 13 and 15(d)

Debt - Previous Credit Facility (Detail)

v3.3.1.900
Debt - Previous Credit Facility (Detail) - USD ($)
6 Months Ended 9 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Standby Letters of Credit    
Line of Credit Facility [Line Items]    
Sub limit for issuance of letters of credit $ 10,000,000 $ 10,000,000.0
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Aggregate principal amount $ 150,000,000.0 $ 200,000,000
Federal Funds Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.50%  
Federal Funds Rate | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   0.50%
Three-Month LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%  
Three-Month LIBOR | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.00%  
Three-Month LIBOR | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.50%  
Prime Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.00%  
Prime Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.25%