Fresh Start Accounting (Fresh Start II) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	2 Months Ended	6 Months Ended
	Feb. 02, 2021	Feb. 02, 2021	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Fresh Start, Parenthetical [Abstract]
Common stock, par value					$ 0.001
Reorganization Adjustments, Cash And Cash Equivalents [Abstract]
Payment of debtor in possession financing fees		$ (183)
Payment of professional fees at the Emergence Date		(2,649)
Payment to cash opt-in claimants	$ 952
Lease rejection settlements paid at the Emergence Date		(400)
Transfers from cash to restricted cash for Professional Fees Escrow and General Unsecured Creditors Escrow		(16,751)
Payment of debt issuance costs for the Credit Facility		(1,920)
Net change in cash and cash equivalents		(21,903)
Reorganization Adjustments, Restricted Cash [Abstract]
Restricted cash - current	16,751	16,751
Debtor Reorganization Items, Accounts Receivables		11
Reorganization Adjustments, Intangibles [Abstract]
Write-off of deferred financing costs related to the Delayed-Draw Term Loan		(12,000)
Capitalization of debt issuance costs associated with the Credit Facility		1,920
Net change in intangibles and other long-term assets		(10,080)
Reorganization Adjustments, Accounts Payable [Abstract]
Payment of professional fees at the Emergence Date		(2,649)
Professional fees recognized and payable at the Emergence Date		1,949
Net change in accounts payable		(700)
Reorganization Adjustments, Accrued Liabilities [Abstract]
Payment of debtor in possession financing fees		(183)
Accrual of professional fees		6,500
Accrual for transfer taxes		1,900
Reinstatement of lease rejection liabilities to be settled post-emergence		700
Accrual of general unsecured claims against parent		125
Net change in accrued liabilities		9,042
Liabilities Subject To Compromise, Settled [Abstract]
Prepetition 7.125% and 7.750% notes including accrued interest and unpaid interest	1,335,794	1,335,794
Lease liabilities settled at the Emergence Date	4,956	4,956
Debtor Reorganization Items, Class 6 Claims	232,022	232,022
Liabilities subject to compromise settled in accordance with the Plan	1,572,772	1,572,772
Reorganization Adjustments, Gain (Loss) On Settlement[Abstract]
Accrued liabilities for lease rejection claims		(700)
Lease liabilities settled at Emergence Date		(1,614)
Payment to settle lease rejection claims		(400)
Proceeds from rights offering	963	963
Cash payout provided to cash opt-in noteholders		(952)
Cash Pool to settle general unsecured claims against the Predecessor		(125)
Issuance of Successor Class A common stock to prepetition noteholders (par value)		(193)
Additional paid-in capital (Successor)		(869,311)
Successor Class A common stock issued to cash opt-out noteholders in the rights offering (par value)		(7)
Additional paid-in capital (rights offering shares)		(33,175)
Gain on settlement of liabilities subject to compromise		667,258
Proceeds from rights offering	963	963
Cash payout provided to cash opt-in noteholders	$ 952
Debtor Reorganization Items, Discount Price	$ 1.31
Debtor Reorganization Items, Implied Discount	$ 32,200
Debtor Reorganization Items, Settlement Value Per Share	$ 46.82
Debtor Reorganization Items, Implied Share Price	$ 45.14
Debtor Reorganization Items, Cancellation Of Common Stock		16
Reorganization Adjustments, APIC [Abstract]
Extinguishment of APIC related to Predecessor's outstanding equity interests		(2,758,812)
Extinguishment of RSUs for the Predecessor's incentive plan		988
Net change in Predecessor's additional paid-in capital		(2,757,824)
Debtor Reorganization Items, Cancellation Of Treasury Shares		4,300
Reorganization Adjustments, APIC, Successor [Abstract]
Postconfirmation, Additional APIC, Common Shares		869,311
Postconfirmation, Additional APIC, Rights Offering		33,175
Postconfirmation, Change In APIC		902,486
Reorganization Adjustments, Retained Earnings [Abstract]
Gain on settlement of liabilities subject to compromise		667,258
Debtor Reorganization Items, Taxes Triggered At Emergence Date		(1,900)
Extinguishment of RSUs for the Predecessor's incentive plan		(988)
Debtor Reorganization Items, Adjustment To Deferred Tax Liability		(3,100)
Debtor Reorganization Items, Professional Fees		(8,449)
Write-off of deferred financing costs related to the Delayed-Draw Term Loan		(12,000)
Extinguishment of Predecessor's equity (par value, APIC, and treasury stock)		2,754,538
Net change in retained earnings		3,395,359
Debtor Reorganization Items, Change In Income Tax Receivable		(170)
Reorganization Adjustments, Change In Inventory And Other Current Assets [Abstract]
Fair value adjustment to other current assets		(1,070)
Net change in inventory and other current assets due to the adoption of fresh start accounting		11,067
Debtor Reorganization Items, Fair Value Adjustment, Assets Held For Sale		3,500	$ 16,500	$ 20,400
Debtor Reorganization Items, Fair Value Adjustment, PPE		139,600
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		1,977,815	540,850
Less: Accumulated Depreciation and Depletion		(1,576,552)
Property, Plant and Equipment, net		401,263	540,850
Debtor Reorganization Items, Fair Value Adjustment, Right Of Use Assets		1,400
Debtor Reorganization Items, Change In Goodwill		138,900
Debtor Reorganization Items, Fair Value Adjustment, Intangible Assets		1,400
Reorganization Adjustments, Intangible Assets [Abstract]
Debtor Reorganization Items, Intangible Assets, Fair Value	$ 4,912	4,912	6,286
Debtor Reorganization Items, Change In Other Long Term Assets		(17,100)
Debtor Reorganization Items, Fair Value Adjustment, Accrued Expenses		1,400
Debtor Reorganization Items, Fair Value Adjustment, Current ARO		4,000
Debtor Reorganization Items, Fair Value Adjustment, Non-Current ARO		34,600
Debtor Reorganization Items, Change In Deferred Tax Liabilities		70,400
Debtor Reorganization Items, Change In Realizable Deferred Tax Assets		18,800
Debtor Reorganization Items, Reclassification Of Deferred Revenue		45,800
Debtor Reorganization Items, FIN48		1,500
Debtor Reorganization Items, Reorganization Expense AOCI		(77,376)
Debtor Reorganization Items, Cumulative Adjustment		(53,251)
Debtor Reorganization Items, Elimination Of AOCI		(130,627)
Trade Names [Member]
Reorganization Adjustments, Intangible Assets [Abstract]
Debtor Reorganization Items, Intangible Assets, Fair Value	2,268	2,268	4,166
Land, Buildings and Improvements [Member]
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		205,237	117,341
Machinery and Equipment [Member]
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		1,103,501	290,593
Rental Services Equipment [Member]
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		617,762	92,861
Other Capitalized Property Plant and Equipment [Member]
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		46,403	35,143
Construction in Progress [Member]
Reorganization Adjustments, PPE [Abstract]
Property, Plant and Equipment		4,912	4,912
Customer Relationships [Member]
Reorganization Adjustments, Intangible Assets [Abstract]
Debtor Reorganization Items, Intangible Assets, Fair Value	2,644	2,644
Patents [Member]
Reorganization Adjustments, Intangible Assets [Abstract]
Debtor Reorganization Items, Intangible Assets, Fair Value			$ 2,120
Common Class A [Member]
Fresh Start, Parenthetical [Abstract]
Common stock, par value				$ 0.01
Reorganization Adjustments, Changes In Common Stock [Abstract]
Issuance of successor Class A common stock to prepetition noteholders (par value)		193
Successor Class A common stock issued to cash opt-out noteholders in the rights offering (par value)		7
Net change in Successor Class A common stock		200
Common Class B [Member]
Fresh Start, Parenthetical [Abstract]
Common stock, par value				$ 0.01
Professional Fee Escrow [Member]
Reorganization Adjustments, Restricted Cash [Abstract]
Restricted cash - current	16,626	16,626
General Unsecured Creditors Escrow [Member]
Reorganization Adjustments, Restricted Cash [Abstract]
Restricted cash - current	$ 125	125
Global [Member]
Reorganization Adjustments, Change In Inventory And Other Current Assets [Abstract]
Fair value adjustment to inventory		$ 12,137
New Senior Unsecured Notes Due 2021 [Member]
Liabilities Subject To Compromise, Settled [Abstract]
Stated interest rate	7.125%	7.125%		7.125%	7.125%
Senior Unsecured Notes Due 2024 [Member]
Liabilities Subject To Compromise, Settled [Abstract]
Stated interest rate	7.75%	7.75%		7.75%	7.75%