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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Bank revolving credit $ 620,000,000 $ 51,000,000 $ 0
Interest underlying the trust preferred securities   11.60%  
Face amount subordinated debentures underlying trust preferred securities   $ 105,443,000  
Aggregate amount of subordinated debentures underlying trust preferred securities   $ 12,231,000  
Deferral period of distribution payments to holders of the trust preferred securities   60 months  
Deferrals of distribution payments to holders of trust preferred securities   $ 0 $ 0
Loan outstanding amount   3,884,000  
6.375% Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal amount of senior notes   $ 330,000,000  
Senior notes, maturity date   Jul. 15, 2022  
Interest rate on senior notes   6.375%  
Term Loan [Member]      
Debt Instrument [Line Items]      
Bank revolving credit $ 550,000,000    
Maturity term of loan   7 years  
Adjusted interest rate   4.50%  
Term Loan [Member] | LIBOR Rate [Member]      
Debt Instrument [Line Items]      
Debt instrument spread variable rate 3.50%    
Term Loan [Member] | LIBOR Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument floor rate   1.00%  
Term Loan [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Debt instrument spread variable rate 2.50%    
Term Loan [Member] | Alternate Base Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument floor rate   2.00%  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Bank revolving credit $ 70,000,000    
Maturity term of loan   5 years  
Adjusted interest rate   3.56%  
Debt instrument maximum borrowing capacity   35.00%  
Loan outstanding amount   $ 51,000,000  
Revolving Credit Facility [Member] | LIBOR Rate [Member]      
Debt Instrument [Line Items]      
Debt instrument spread variable rate   3.25%  
Revolving Credit Facility [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Debt instrument spread variable rate   2.25%  
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Debt instrument maximum borrowing capacity   78.00%  
Loan outstanding amount   $ 3,884,000