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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total long-term debt $ 333,854 $ 362,255
Less current portion (23,908) (22,940)
Unamortized deferred issuance costs (1,962) (2,396)
Long-term debt, net of current portion 307,984 336,919
Revolving Credit Facility, Due Feb. 2024 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 62,052 84,255
2.40% Term Loan, Due Jun. 2022 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 2,927 4,012
Term Loan, Due Feb. 2024 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 241,478 240,969
2.05% Term Loan, Due Mar. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 15,623 19,487
1.30% Term Loan, Due Jun. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 4,600 5,617
1.55% Term Loan, Due Sep. 2025 [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 7,174 $ 7,915