Fresh Start Accounting - Schedule of Fresh Start Adjustments to Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 24, 2021	Apr. 23, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 38,388		$ 79,982	$ 405,869
Restricted cash	24,341		35,447	24,511
Accounts receivable	151,917		134,906	136,222
Less: allowance for credit losses	(5,582)		(5,555)	(5,562)
Accounts receivable, net	146,335		129,351	130,660
Prepaid expenses and other current assets	61,440		58,655	62,275
Assets held for sale	1,000		1,000	2,000
Total current assets	271,504		304,435	625,315
Drilling and other property and equipment, net of accumulated depreciation	1,175,895		1,354,650	4,122,809
Other assets	84,041		57,047	200,329
Deferred tax asset			6,716
Total assets	1,531,440		1,722,848	4,948,453
Current liabilities:
Accounts payable	38,661		65,401	33,437
Accrued liabilities	143,736		123,055	140,788
Current finance lease liabilities	15,865		15,148
Taxes payable	34,500		22,034	27,214
Total current liabilities	232,762		225,638	201,439
Deferred tax liability	1,626			28,338
Other liabilities	114,748		117,499	117,305
Noncurrent finance lease liabilities	148,358		158,919
Long-term debt	266,241		285,982
Total liabilities not subject to compromise	763,735		788,038	347,082
Liabilities subject to compromise				2,618,805
Stockholders’ equity:
Predecessor or Successor preferred stock
Predecessor or Successor common stock	10			1,453
Predecessor treasury stock, at cost				(206,163)
Successor additional paid-in capital			934,800
(Accumulated deficit) retained earnings	(177,344)			157,297
Total stockholders’ equity	767,705	$ 934,810	934,810	1,982,566	$ 3,232,210	$ 3,584,653
Total liabilities and stockholders’ equity	1,531,440		1,722,848	4,948,453
Fresh Start Adjustments
Current assets:
Accounts receivable			802
Accounts receivable, net			802
Prepaid expenses and other current assets			(34,455)
Total current assets			(33,653)
Drilling and other property and equipment, net of accumulated depreciation			(2,720,485)
Other assets			(10,282)
Deferred tax asset			6,716
Total assets			(2,757,704)
Current liabilities:
Accrued liabilities			(55,961)
Total current liabilities			(55,961)
Deferred tax liability			(34,447)
Deferred tax asset, reclassification			7,518
Other liabilities			(9,837)
Total liabilities not subject to compromise			(92,727)
Stockholders’ equity:
Predecessor or Successor preferred stock
(Accumulated deficit) retained earnings			(2,664,977)
Total stockholders’ equity			(2,664,977)
Total liabilities and stockholders’ equity			(2,757,704)
Preferred Stock [Member]
Stockholders’ equity:
Predecessor or Successor preferred stock
Preferred Stock [Member] | Fresh Start Adjustments
Stockholders’ equity:
Predecessor or Successor preferred stock
Common Stock [Member]
Stockholders’ equity:
Predecessor or Successor common stock			10
Total stockholders’ equity	$ 10	$ 10		$ 1,453	$ 1,448	$ 1,444
Previously Reported | Reorganization, Chapter 11, Predecessor, before Adjustment
Current assets:
Cash and cash equivalents			333,699
Restricted cash			3,274
Accounts receivable			134,104
Less: allowance for credit losses			(5,555)
Accounts receivable, net			128,549
Prepaid expenses and other current assets			108,594
Assets held for sale			1,000
Total current assets			575,116
Drilling and other property and equipment, net of accumulated depreciation			3,892,150
Other assets			179,783
Total assets			4,647,049
Current liabilities:
Accounts payable			66,397
Accrued liabilities			246,141
Short-term debt			442,034
Taxes payable			22,034
Total current liabilities			776,606
Deferred tax liability			23,060
Other liabilities			217,434
Total liabilities not subject to compromise			1,017,100
Liabilities subject to compromise			2,044,877
Stockholders’ equity:
Predecessor or Successor preferred stock
Predecessor or Successor common stock			1,453
Predecessor additional paid-in capital			2,029,978
Predecessor treasury stock, at cost			(206,163)
(Accumulated deficit) retained earnings			(240,196)
Total stockholders’ equity			1,585,072
Total liabilities and stockholders’ equity			4,647,049
Previously Reported | Preferred Stock [Member] | Reorganization, Chapter 11, Predecessor, before Adjustment
Stockholders’ equity:
Predecessor or Successor preferred stock
Reorganization Adjustments | Reorganization, Chapter 11, Predecessor, before Adjustment
Current assets:
Cash and cash equivalents			(253,717)
Restricted cash			32,173
Prepaid expenses and other current assets			(15,484)
Total current assets			(237,028)
Drilling and other property and equipment, net of accumulated depreciation			182,985
Other assets			(112,454)
Total assets			(166,497)
Current liabilities:
Accounts payable			(996)
Accrued liabilities			(67,125)
Short-term debt			(442,034)
Current finance lease liabilities			15,148
Total current liabilities			(495,007)
Deferred tax liability			3,869
Other liabilities			(90,098)
Noncurrent finance lease liabilities			158,919
Long-term debt			285,982
Total liabilities not subject to compromise			(136,335)
Liabilities subject to compromise			(2,044,877)
Stockholders’ equity:
Predecessor or Successor preferred stock
Predecessor or Successor common stock			(1,453)
Predecessor additional paid-in capital			(2,029,978)
Predecessor treasury stock, at cost			206,163
Successor additional paid-in capital			934,800
(Accumulated deficit) retained earnings			2,905,173
Total stockholders’ equity			2,014,715
Total liabilities and stockholders’ equity			(166,497)
Reorganization Adjustments | Preferred Stock [Member] | Reorganization, Chapter 11, Predecessor, before Adjustment
Stockholders’ equity:
Predecessor or Successor preferred stock
Reorganization Adjustments | Common Stock [Member] | Reorganization, Chapter 11, Predecessor, before Adjustment
Stockholders’ equity:
Predecessor or Successor common stock			$ 10