Revenue and Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 05, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Operating revenues	$ 77,481	$ 250,371	$ 241,836	$ 562,147	$ 761,065
Floaters
Disaggregation of Revenue [Line Items]
Operating revenues	50,057	158,313	127,286	349,634	367,304
Jackups
Disaggregation of Revenue [Line Items]
Operating revenues	23,994	72,841	99,764	166,046	347,251
Contract drilling services
Disaggregation of Revenue [Line Items]
Operating revenues	$ 74,051	$ 231,154	$ 227,050	$ 515,680	$ 714,555