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Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Parenthetical) (Detail) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Quoted price	$ 97.0	$ 103.25

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- References

No definition available.

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Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
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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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Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant