Fresh Start Accounting - Fresh Start Adjustments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 23, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Fair value adjustment of rig spare parts and supplies		$ (7,200)
Write-off of current deferred contract assets		(27,300)
Fair value adjustment to drilling and other property and equipment net of accumulated depreciation		(2,712,100)
Fair value adjustment of BOP finance lease assets		(8,400)
Write-off of current deferred contract liabilities		(56,400)
Fair value adjustment to current other lease liabilities		400
Adjustment to deferred taxes	$ 1,626		$ 28,338
Write-off of non-current deferred contract liabilities		(11,100)
Fair value adjustment of non-current other lease liabilities		1,300
ASC 740 | Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Adjustment to deferred taxes		$ (34,400)