Chapter 11 Proceedings - Debtor-in-Possession Condensed Combined Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operating activities:
Net loss	$ (361,681)	$ (861,940)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	74,626	93,043
Loss on impairment of assets	197,027	774,028
Gain on disposition of assets	(5,401)	(3,433)
Deferred tax provision	(5,565)	(13,797)
Contract liabilities, net	6,974	34,285
Contract assets, net	(326)	3,092
Deferred contract costs, net	(9,176)	(14,576)
Other assets, noncurrent	1,279	(393)
Other liabilities, noncurrent	(110)	(3,346)
Other	282	451
Changes in operating assets and liabilities:
Accounts receivable	(14,993)	(17,307)
Prepaid expenses and other current assets	(1,340)	131
Accounts payable and accrued liabilities	68,274	(9,586)
Taxes payable	922	(5,036)
Net cash used in operating activities	(49,208)	(22,841)
Investing activities:
Capital expenditures	(40,617)	(74,850)
Proceeds from disposition of assets, net of disposal costs	7,400	4,548
Net cash used in investing activities	(33,217)	(70,302)
Financing activities:
Debt issuance costs and arrangement fees	(2,290)
Net cash (used in) provided by financing activities	(2,290)	436,000
Net change in cash, cash equivalents and restricted cash	(84,715)	342,857
Cash, cash equivalents and restricted cash, beginning of period	430,380	156,281	$ 156,281
Cash, cash equivalents and restricted cash, end of period	345,665	$ 499,138	430,380
Debtor [Member]
Operating activities:
Net loss	(354,631)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	74,496
Loss on impairment of assets	197,027
Gain on disposition of assets	(3,442)
Deferred tax provision	(5,558)
Contract liabilities, net	6,974
Contract assets, net	(326)
Deferred contract costs, net	(9,176)
Other assets, noncurrent	1,256
Other liabilities, noncurrent	2,494
Other	(370)
Changes in operating assets and liabilities:
Accounts receivable	(14,628)
Prepaid expenses and other current assets	(506)
Accounts payable and accrued liabilities	66,599
Taxes payable	1,001
Due to non-debtor subsidiaries	(4,118)
Net cash used in operating activities	(42,908)
Investing activities:
Capital expenditures	(43,605)
Proceeds from disposition of assets, net of disposal costs	4,442
Net cash used in investing activities	(39,163)
Financing activities:
Debt issuance costs and arrangement fees	(2,290)
Net cash (used in) provided by financing activities	(2,290)
Net change in cash, cash equivalents and restricted cash	(84,361)
Cash, cash equivalents and restricted cash, beginning of period	414,918
Cash, cash equivalents and restricted cash, end of period	$ 330,557		$ 414,918