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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total long-term debt $ 522,760 $ 483,330
Less current portion (10,982) (11,298)
Unamortized deferred issuance costs (1,601) (1,934)
Long-term debt, net of current portion 510,177 470,098
Revolving Credit Facility, Due Mar. 2020 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 217,860 171,200
5.375% Notes, Due Oct. 2020 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 250,000 250,000
Long-term debt, net of current portion 250,000 250,000
2.40% Term Loan, Due Jun. 2022 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 6,661 7,710
2.05% Term Loan, Due Mar. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 29,556 33,607
1.30% Term Loan, Due Jun. 2023 [Member]    
Debt Instrument [Line Items]    
Total long-term debt 8,327 9,423
1.55% Term Loan, Due Sep. 2025 [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 10,356 $ 11,390