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Long-Term Debt - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Principal payments on long -term debt due in 2022   $ 149,300,000  
Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Available borrowings capacity under credit agreement     $ 112,150,000
Senior secured credit facility, maturity date Jun. 30, 2022    
Credit agreement, covenant description   The Credit Agreement is a senior secured lending facility, consisting of a line of credit of up to $250,000, an accordion feature of up to $100,000 and a maturity date of June 30, 2022. The Credit Agreement contains two key financial covenants; namely, borrowers are required to maintain a Consolidated Funded Debt Ratio of no more than 3.25-to-1 and a Consolidated Fixed Charge Covenant Ratio of at least 1.25-to-1.  
Credit agreement, variable rate description   Under the Credit Agreement, revolving loans bear interest at a variable rate based, at borrower’s election with proper notice, on either (i) LIBOR plus the “Applicable Rate” which is based upon the Consolidated Funded Debt Ratio (“Eurocurrency Rate Loan”) or (ii) the greater of (x) the Prime Rate, (y) the Federal Funds Rate plus 0.5%, and (z) the Daily One-Month LIBOR Rate plus 1.00%, plus, in the case of (x), (y) or (z) the Applicable Rate (“Alternate Base Rate Loan”)  
Credit agreement, interest rate   3.74%  
Federal Funds Rate | Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Credit agreement, variable rate basis 0.50%    
One-Month LIBOR Rate | Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Credit agreement, variable rate basis 1.00%    
Eurocurrency Rate | Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Credit agreement, interest payment period, description   last day of each interest period (either one, two, three or six months, as selected by the borrower)  
Alternate Base Rate | Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Credit agreement, interest payment period, description   last business day of each month  
Maximum | Senior Secured Revolving Line of Credit      
Debt Instrument [Line Items]      
Available borrowings capacity under credit agreement $ 250,000,000    
Consolidated funded debt ratio 325.00%    
Capacity to increase borrowings under credit agreement   $ 26,977,000  
Maximum | Term Loan      
Debt Instrument [Line Items]      
Accordion feature $ 100,000,000    
Minimum      
Debt Instrument [Line Items]      
Consolidated fixed charge covenant ratio 125.00%