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Debt, Capital Lease and Other Financing Obligations - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jan. 06, 2017
USD ($)
Aug. 31, 2017
May 31, 2017
Dec. 31, 2017
USD ($)
Lessee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Debt outstanding       $ 117,500,000    
Accounts receivable securitization financing facility       $ 25,000,000 $ 39,500,000  
Capitalized lease term   12-month 36-month terms      
Number of capital leases | Lessee       2    
Amount owed under other financing agreement       $ 2,489,000 0  
ABS Facility [Member]            
Debt Instrument [Line Items]            
Credit facility, borrowing capacity       $ 250,000,000    
Line of credit maturity date       Jun. 23, 2019    
Weighted average amount outstanding borrowings       $ 153,759,000 145,376,000 $ 112,101,000
Debt outstanding       25,000,000    
Receivables at fair value       1,141,520,000 $ 936,467,000  
Amount of facility permitted by qualified receivables       250,000,000    
Accounts receivable securitization financing facility       $ 25,000,000    
Credit facility, interest rate at period end       2.41%    
Credit facility, usage fee       0.85%    
Monthly commitment fee on unused portion of ABS facility       0.375%    
Weighted average interest rate       2.40% 1.90% 1.60%
Outstanding borrowings at period end       $ 25,000,000    
Senior Revolving Credit Facility Term Loan A and Asset Backed Securitization Facility [Member]            
Debt Instrument [Line Items]            
Credit facility, borrowing capacity       $ 766,250,000    
Maximum leverage ratio times adjusted earnings       3.50    
Senior Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Credit facility, borrowing capacity       $ 350,000,000    
Incremental borrowings under Term Loan A $ 175,000,000          
Percentage of amortization payments year one       5.00%    
Percentage of amortization payments year two       7.50%    
Percentage of amortization payments year three       10.00%    
Percentage of amortization payments year four       12.50%    
Percentage of amortization payments year five       15.00%    
Repayment of borrowing date       Mar. 31, 2021    
Line of credit due at maturity       $ 107,187,500    
Line of credit maturity date       Jun. 23, 2021    
Applicable floating interest rate       3.49%    
Weighted average amount outstanding borrowings       $ 63,604,000 $ 35,811,000 $ 21,987,000
Debt outstanding       $ 117,500,000    
Credit facility, interest rate at period end       3.49%    
Outstanding borrowings at period end       $ 117,500,000    
Senior Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Commitment on the unused portion of the facility       0.25%    
Participation fee on letter of credit       1.25%    
Senior Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Commitment on the unused portion of the facility       0.45%    
Participation fee on letter of credit       2.25%    
Senior Revolving Credit Facility [Member] | Foreign Currency Borrowings [Member]            
Debt Instrument [Line Items]            
Credit facility, borrowing capacity       $ 50,000,000    
Senior Revolving Credit Facility [Member] | Prime Rate [Member]            
Debt Instrument [Line Items]            
Interest rate description       Prime rate plus a predetermined spread of 0.00% to 0.75%    
Senior Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Pre-determined spread       0.00%    
Senior Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Pre-determined spread       0.75%    
Senior Revolving Credit Facility [Member] | LIBOR Rate [Member]            
Debt Instrument [Line Items]            
Interest rate description       LIBOR rate plus a pre-determined spread of 1.25% to 2.25%    
Senior Revolving Credit Facility [Member] | LIBOR Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Pre-determined spread       1.25%    
Senior Revolving Credit Facility [Member] | LIBOR Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Pre-determined spread       2.25%    
Term Loan A [Member]            
Debt Instrument [Line Items]            
Applicable floating interest rate       3.57%    
Debt outstanding       $ 166,250,000    
Credit facility, interest rate at period end       3.57%    
Outstanding borrowings at period end       $ 166,250,000    
Senior Revolving Credit Facility and Term Loan A [Member]            
Debt Instrument [Line Items]            
Interest expense       $ 8,491,000 $ 2,191,000 $ 1,813,000