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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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

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