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Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt issuance costs	$ (12,048)	$ (9,372)
Total debt	692,577	743,918
Current portion of long-term debt	17,774	90,323
Less current portion of debt issuance costs	(2,976)	(4,970)
Total long-term debt	674,803	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	404,625	365,290
Current portion of long-term debt	20,750	95,293
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 0	$ 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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-SubTopic 10
-Section S99
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