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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 370,353	$ 363,870
Less current portion	(9,098)	(7,366)
Unamortized deferred issuance costs	(2,889)	(3,208)
Long-term debt, net of current portion	358,366	353,296
Total long-term debt	370,353	363,870
Revolving Credit Facility, Due Mar. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	48,851	58,792
Total long-term debt	48,851	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	9,516	10,109
Total long-term debt	9,516	10,109
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	40,000	42,130
Total long-term debt	40,000	42,130
1.30% Term Loan, Due Jun. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	11,102
Total long-term debt	11,102
1.55% Term Loan, Due Sep. 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt	10,884	2,839
Total long-term debt	$ 10,884	$ 2,839

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