Annual report pursuant to Section 13 and 15(d)

Acquisitions and Recent Transactions - 2017 Debt Transactions - Additional Information (Detail)

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Acquisitions and Recent Transactions - 2017 Debt Transactions - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
May 19, 2017
Jan. 30, 2017
Feb. 28, 2017
Dec. 31, 2018
Dec. 31, 2017
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Debt instrument, face amount       $ 238,600,000  
Debt instrument, interest rate, stated percentage       4.58%  
Payments for loans   $ 2,000,000      
Gains (losses) on extinguishment of debt, total   (4,500)   $ 648,000 $ (2,775,000)
Amortization of financing costs   $ 12,000 $ 18,000 1,114,000 940,000
Unamortized Discount [Member] | Cycleprophet.com Business Acquisition [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Gains (losses) on extinguishment of debt, total $ (600,000)        
Swing Line Loans [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Line of credit facility, maximum borrowing capacity 7,500,000        
Revolver [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Long-term line of credit, noncurrent 25,000,000        
Term Loan B [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Debt instrument, face amount     300,000,000    
Line of credit facility, maximum borrowing capacity       300,000,000  
Payments for loans 258,000,000   3,000,000    
Gains (losses) on extinguishment of debt, total     $ (6,200)    
Term Loan B [Member] | Unamortized Debt Issuance Costs [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Gains (losses) on extinguishment of debt, total (1,500,000)        
Revolver [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Line of credit facility, maximum borrowing capacity       $ 25,000,000  
Payments for loans 4,100,000        
Amortization of financing costs         $ 26,000
Revolver [Member] | Unamortized Debt Issuance Costs [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Gains (losses) on extinguishment of debt, total (56,000)        
Standby Letters of Credit [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Line of credit facility, maximum borrowing capacity 5,000,000        
Senior Secured Debt [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Debt instrument, face amount $ 255,000,000        
Debt instrument, interest rate, stated percentage 6.75%     6.75%  
Asset-Based Revolving Credit Facility [Member]          
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]          
Debt instrument, face amount $ 30,000,000        
Amortization of financing costs       $ 700,000