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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2014
Dec. 31, 2015
Debt Instrument [Line Items]          
Bank revolving credit $ 16,000,000   $ 16,000,000 $ 620,000,000 $ 28,000,000
Interest underlying the trust preferred securities     11.60%    
Face amount subordinated debentures underlying trust preferred securities 105,443,000   $ 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 $ 5,559,000   $ 5,559,000    
6.375% Senior Notes [Member]          
Debt Instrument [Line Items]          
Principal amount of senior notes       $ 330,000,000  
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%   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 3.88%   3.88%    
Debt instrument maximum borrowing capacity     35.00%    
Loan outstanding amount $ 16,000,000   $ 16,000,000    
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     31.00%    
Loan outstanding amount 5,559,000   $ 5,559,000    
Long-term Debt [Member] | 6.375% Senior Notes [Member]          
Debt Instrument [Line Items]          
Deferred Finance Costs, Net 6,668,000   6,668,000   7,223,000
Long-term Debt [Member] | Term Loan [Member]          
Debt Instrument [Line Items]          
Deferred Finance Costs, Net 11,114,000   11,114,000   12,225,000
Long-term Debt [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]          
Debt Instrument [Line Items]          
Deferred Finance Costs, Net $ 17,800,000   $ 17,800,000   $ 19,400,000