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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
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