Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Collateral deposits	$ 19,570
Prepaid taxes	15,442	$ 16,112
Deferred contract costs	6,688	19,808
Rig spare parts and supplies	6,405	12,606
Prepaid insurance	5,492	2,446
Prepaid rig costs	3,947	2,317
Prepaid legal retainers	1,019	2,408
Current contract assets	927	2,870
Other	6,302	3,708
Total	$ 65,792	$ 62,275