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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |
Total long-term debt | $ 367,156 | $ 363,870
Less current portion | (7,704) | (7,366)
Unamortized deferred issuance costs | (3,057) | (3,208)
Long-term debt, net of current portion | 356,395 | 353,296
Total long-term debt | 367,156 | 363,870
Revolving Credit Facility, Due Mar. 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 61,482 | 58,792
Total long-term debt | 61,482 | 58,792
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
Total long-term debt | 250,000 | 250,000
2.40% Term Loan, Due Jun. 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 10,166 | 10,109
Total long-term debt | 10,166 | 10,109
2.05% Term Loan, Due Mar. 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 42,539 | 42,130
Total long-term debt | 42,539 | 42,130
1.55% Term Loan, Due Sep. 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 2,969 | 2,839
Total long-term debt | $ 2,969 | $ 2,839

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