Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Apr. 23, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Collateral deposits	$ 18,570
Prepaid taxes	17,440		$ 16,112
Deferred contract costs	7,501		19,808
Prepaid insurance	4,292		2,446
Prepaid rig costs	3,575		2,317
Rig spare parts and supplies	3,251		12,606
Current contract assets	1,392		2,870
Prepaid legal retainers	432		2,408
Other	5,648		3,708
Change in prepaid expenses and other current assets	$ 62,101	$ 58,655	$ 62,275