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Debt - Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs	$ (9,076)	$ (10,521)
Total debt	677,799	685,729
Current portion of long-term debt	22,988	17,786
Less current portion of debt issuance costs	(2,950)	(2,964)
Total long-term debt	654,811	667,943
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	383,875	394,250
Current portion of long-term debt	25,938	20,750
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 3,000	$ 2,000

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