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LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended	20 Months Ended
	May 01, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Cash paid for amounts included in measurement of operating lease liabilities	$ 44,888		$ 139,507	$ 89,567
Lease liabilities arising from obtaining right-of-use assets	913,598		56,243	$ 29,498
Fresh start adjustment to Operating lease obligations	458,989
Non-cash operating lease expense	$ 14,300	$ 61,600	$ 103,400

X

- Definition

Fresh-Start Adjustment, Increase (Decrease), Operating Lease, Liability

+ References

No definition available.

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Balance Type:	credit
Period Type:	instant

X

- Definition

Operating Lease, Noncash Expense

+ References

No definition available.

+ Details

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Namespace Prefix:	cik0001400891_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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