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Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt issuance costs	$ (11,272)	$ (9,372)
Total debt	692,166	743,918
Current portion of long-term debt	17,772	90,323
Less current portion of debt issuance costs	(2,978)	(4,970)
Total long-term debt	674,394	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	399,438	365,290
Current portion of long-term debt	20,750	95,293
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 4,000	$ 88,000

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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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