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Fair Value of financial instruments - Additional Information (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Estimate of Fair Value Measurement | Senior Secured Credit Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	$ 4,217,710
Estimate of Fair Value Measurement | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	4,519,525
Reported Value Measurement | Senior Secured Credit Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	4,159,799
Reported Value Measurement | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	$ 4,458,549

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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