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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total long-term debt $ 354,514 $ 413,023
Less current portion (22,235) (10,785)
Unamortized deferred issuance costs (2,508) (1,276)
Long-term debt, net of current portion 329,771 400,962
Revolving Credit Facility, Due Mar. 2020 [Member]    
Debt Instrument [Line Items]    
Total long-term debt   114,495
Revolving Credit Facility, Due Feb. 2024 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 79,490  
5.375% Notes, Due Oct. 2020 [Member]    
Debt Instrument [Line Items]    
Total long-term debt   250,000
2.40% Term Loan, Due Jun. 2022 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 4,278 5,725
Term Loan, Due Feb. 2024 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 236,564  
2.05% Term Loan, Due Mar. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 20,342 25,972
1.30% Term Loan, Due Jun. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 5,834 7,361
1.55% Term Loan, Due Sep. 2025 [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 8,006 $ 9,470