Fair Value of financial instruments - Additional Information (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Reported Value Measurement \| Senior Secured Credit Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	$ 5,302,569
Debt Instrument, Unamortized Discount	6,724
Deferred Financing Costs	11,957
Reported Value Measurement \| Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	4,465,057
Deferred Financing Costs	34,943
Estimate of Fair Value Measurement \| Senior Secured Credit Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	5,353,109
Estimate of Fair Value Measurement \| Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt value	$ 4,404,175

Amount, after accumulated amortization, of debt discount.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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