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Debt - Additional Information (Detail) - SunTrust Bank [Member]
 3 Months Ended
Mar. 31, 2020
USD ($)
Line of Credit Facility [Line Items]  
Description of Line of credit facility Covenant • a funded debt leverage ratio (consolidated debt/consolidated EBITDA) of not greater than 3.0 to 1.0; and • an interest coverage ratio (consolidated EBITDA/consolidated interest expense) of not less than 3.0 to 1.0.
Minimum [Member]  
Line of Credit Facility [Line Items]  
Commitment fee paid per annum 0.20%
Maximum [Member]  
Line of Credit Facility [Line Items]  
Commitment fee paid per annum 0.30%
Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Maturity date of Loan agreement Nov. 24, 2020
Interest rate under credit facility the borrowings under the Revolving Credit Facility bear interest at either (1) a rate per annum equal to the highest of SunTrust’s prime rate or 0.5% in excess of the Federal Funds Rate or 1.0% in excess of one-month LIBOR (the “Base Rate”), plus an applicable margin, or (2) the one, two, three, or six month per annum LIBOR for deposits in the applicable currency (the “Eurocurrency Rate”), as selected by the Company, plus an applicable margin. The applicable margin for Eurocurrency Rate loans depends on the Company’s funded debt leverage ratio and varies from 1.50% to 2.00%. The applicable margin for Base Rate loans depends on the Company’s funded debt leverage ratio and varies from 0.50% to 1.50%
Maximum borrowing capacity under credit facility $ 50,000,000.0
Increase in revolving credit facility 25,000,000.0
Principal payments prior to maturity 0
Outstanding balance on revolving credit facility 0
Revolving Credit Facility [Member] | Swing Line Sub Facility [Member]  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity under credit facility 5,000,000.0
Revolving Credit Facility [Member] | Letter of Credit Subfacility [Member]  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity under credit facility $ 5,000,000.0
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Interest Rate During Period 0.50%
Revolving Credit Facility [Member] | Base Rate [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Interest Rate During Period 1.00%
Revolving Credit Facility [Member] | Minimum [Member]  
Line of Credit Facility [Line Items]  
Interest coverage ratio 300.00%
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]  
Line of Credit Facility [Line Items]  
Applicable margin for loans 0.50%
Revolving Credit Facility [Member] | Minimum [Member] | Eurodollar [Member]  
Line of Credit Facility [Line Items]  
Applicable margin for loans 1.50%
Revolving Credit Facility [Member] | Maximum [Member]  
Line of Credit Facility [Line Items]  
Debt leverage ratio 300.00%
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]  
Line of Credit Facility [Line Items]  
Applicable margin for loans 1.50%
Revolving Credit Facility [Member] | Maximum [Member] | Eurodollar [Member]  
Line of Credit Facility [Line Items]  
Applicable margin for loans 2.00%