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Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs	$ (13,993)	$ (10,521)
Total debt	674,924	685,729
Current portion of long-term debt	18,765	17,786
Less current portion of debt issuance costs	(3,003)	(2,964)
Total long-term debt	656,159	667,943
5.75% Senior Notes, due August 2026 [Member]
Debt Instrument [Line Items]
Total debt	400,000
6.375% Senior Notes, due August 2020 [Member]
Debt Instrument [Line Items]
Total debt		300,000
Term Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	288,917	394,250
Current portion of long-term debt	$ 21,768	20,750
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt		$ 2,000

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