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Indebtedness - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2017
Dec. 31, 2018
Jun. 30, 2018
Debt Instrument [Line Items]        
Short term debt $ 0   $ 0  
Senior Secured Revolving Line of Credit        
Debt Instrument [Line Items]        
Available borrowings capacity under credit agreement       $ 137,047,000
Senior secured credit facility, maturity date   Jun. 30, 2022    
Credit agreement, covenant description 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 0.50%, 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”).      
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 $ 30,557,000      
Maximum | Term Loan        
Debt Instrument [Line Items]        
Accordion feature   $ 100,000,000    
Minimum        
Debt Instrument [Line Items]        
Consolidated fixed charge covenant ratio   125.00%