Revolving Term Credit Facilities and Debt - Additional Information, Term Loan A with PNC (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 23, 2016
Line of Credit Facility [Line Items]    
Term loan facility $ 133,916  
Term loan facility, Gross 137,055  
Debt issuance cost 1,561  
ASV Loan Facilities [Member] | Term Loan A [Member]    
Line of Credit Facility [Line Items]    
Term loan facility   $ 8,500
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member]    
Line of Credit Facility [Line Items]    
Term loan facility 8,410 $ 8,500
Term loan facility, Gross 8,500  
Debt issuance cost $ 90  
Line of credit facility interest rate description The initial spread for domestic and LIBOR rates are initially fixed at 2% and 3% until delivery of certain reporting documents with respect to the fiscal quarter ending March 31, 2017, respectively. At which point the spread for domestic rate will range from 1% to 1.5% and LIBOR spread from 2% to 2.5% depending on the average undrawn availability (as defined in the loan agreement).  
Weighted average interest rate 4.76%  
Principal payment of loan $ 212  
Debt Instrument, Frequency of periodic payment quarterly  
Payment commencing date Mar. 31, 2017  
Debenture, maturity date Dec. 23, 2021  
Frequency of interest payments monthly  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | Domestic Rate [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 2.00%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | Domestic Rate [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 1.00%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | Domestic Rate [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 1.50%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | LIBOR [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 3.00%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | LIBOR [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 2.00%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | LIBOR [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Interest rate spread for base rate 2.50%  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | One Month Libor [Member]    
Line of Credit Facility [Line Items]    
Borrowing term option for funds borrowed under the LIBOR option 1 month  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | Two Month Libor [Member]    
Line of Credit Facility [Line Items]    
Borrowing term option for funds borrowed under the LIBOR option 2 months  
ASV Loan Facilities [Member] | PNC Bank, National Association [Member] | Term Loan A [Member] | Three Month Libor [Member]    
Line of Credit Facility [Line Items]    
Borrowing term option for funds borrowed under the LIBOR option 3 months