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Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt issuance costs | $ (10,521) | $ (9,372)
Total debt | 685,729 | 743,918
Current portion of long-term debt | 17,786 | 90,323
Less current portion of debt issuance costs | (2,964) | (4,970)
Total long-term debt | 667,943 | 653,595
6.375% Senior Notes, due August 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 300,000 | 300,000
Term Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 394,250 | 365,290
Current portion of long-term debt | 20,750 | 95,293
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 2,000 | $ 88,000

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