Chapter 11 Proceedings - Debtor-in-Possession Condensed Combined Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 311,357	$ 405,869
Accounts receivable	151,224	136,222
Less: allowance for credit losses	(5,571)	(5,562)
Accounts receivable, net	145,653	130,660
Prepaid expenses and other current assets	89,666	62,275
Assets held for sale	1,000	2,000
Total current assets	581,984	625,315
Drilling and other property and equipment, net of accumulated depreciation	3,900,414	4,122,809
Other assets	197,044	200,329
Total assets	4,679,442	4,948,453
Current liabilities:
Accounts payable	69,278	33,437
Accrued liabilities	236,649	140,788
Taxes payable	28,432	27,214
Current maturities of long-term debt	442,034
Total current liabilities	776,393	201,439
Deferred tax liability	22,766	28,338
Other liabilities	214,521	117,305
Total liabilities not subject to compromise	1,013,680	347,082
Liabilities subject to compromise	2,044,877	2,618,805
Total debtors’ equity	1,620,885	1,982,566	$ 2,371,488	$ 3,232,210
Total liabilities and stockholders’ equity	4,679,442	4,948,453
Debtor [Member]
Current assets:
Cash and cash equivalents	296,249	390,407
Restricted cash	34,308	24,511
Accounts receivable	138,619	123,981
Less: allowance for credit losses	(113)	(102)
Accounts receivable, net	138,506	123,879
Prepaid expenses and other current assets	77,833	50,439
Assets held for sale	1,000	1,000
Total current assets	547,896	590,236
Drilling and other property and equipment, net of accumulated depreciation	3,890,261	4,112,527
Investments in non-debtor subsidiaries	2,468,384	2,468,384
Other assets	181,641	184,955
Total assets	7,088,182	7,356,102
Current liabilities:
Accounts payable	64,316	30,280
Accrued liabilities	223,311	130,133
Taxes payable	27,517	25,005
Current maturities of long-term debt	442,034
Amounts payable to non-debtor subsidiaries	1,053,795	1,057,913
Total current liabilities	1,810,973	1,243,331
Note payable to non-debtor subsidiary	328,000	328,000
Deferred tax liability	6,342	11,907
Other liabilities	162,227	63,674
Total liabilities not subject to compromise	2,307,542	1,646,912
Liabilities subject to compromise	2,044,877	2,618,805
Total debtors’ equity	2,735,763	3,090,385
Total liabilities and stockholders’ equity	$ 7,088,182	$ 7,356,102