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Debt, Inventory Financing Facility, Capital Leases and Other Financing Obligations - Additional Information (Detail)
1 Months Ended 9 Months Ended
Jan. 06, 2017
USD ($)
Aug. 31, 2017
May 31, 2017
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]          
Debt outstanding       $ 216,000,000  
Accounts receivable securitization financing facility       160,000,000 $ 39,500,000
Accounts payable-inventory financing facility       $ 224,072,000 154,930,000
Capitalized lease term   12-month 36-month terms    
Number of capital leases       2  
Capital lease obligations       $ 3,277,000 $ 1,231,000
Datalink [Member]          
Debt Instrument [Line Items]          
Financing obligation related to acquisition       2,950,000  
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        
Line of credit maturity date       Jun. 23, 2021  
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  
Applicable floating interest rate       2.70%  
Debt outstanding       $ 216,000,000  
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       2.74%  
Debt outstanding       $ 168,438,000  
Outstanding borrowings at period end       168,438,000  
ABS Facility [Member]          
Debt Instrument [Line Items]          
Credit facility, borrowing capacity       $ 250,000,000  
Line of credit maturity date       Jun. 23, 2019  
Credit facility, interest rate at period end       2.14%  
Credit facility, usage fee       0.85%  
Monthly commitment fee on unused portion of ABS facility       0.375%  
Amount of facility permitted by qualified receivables       $ 250,000,000  
Accounts receivable securitization financing facility       160,000,000  
Outstanding borrowings at period end       160,000,000  
Senior Revolving Credit Facility Term Loan A and Asset Backed Securitization Facility [Member]          
Debt Instrument [Line Items]          
Credit facility, borrowing capacity       $ 768,438,000  
Maximum leverage ratio times adjusted earnings       3.50  
Outstanding borrowings at period end       $ 216,000,000  
Inventory Financing Facility [Member]          
Debt Instrument [Line Items]          
Inventory financing facility maximum borrowing capacity       $ 325,000,000  
Inventory financing facility maturity date       Jun. 23, 2021  
Accounts payable-inventory financing facility       $ 224,072,000  
Inventory financing facility interest rate if balances are not paid within stated vendor terms       Prime plus 1.25%  
Inventory financing facility rate if vendor terms not met equal prime plus       1.25%  
Inventory Financing Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Inventory financing facility additional borrowing capacity       $ 25,000,000