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Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) Rigs	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Rigs Segment Customer	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($) Customer
Segment Reporting Disclosure [Line Items]
Number of reportable business segments | Segment									3
Total operating revenues	$ 795,937	$ 867,478	$ 854,418	$ 809,164	$ 787,334	$ 684,989	$ 579,186	$ 305,175	$ 3,326,997	$ 2,356,684	$ 915,866
Long-lived assets	$ 4,002,549				4,254,730				$ 4,002,549	$ 4,254,730
Major Customer
Segment Reporting Disclosure [Line Items]
Total operating revenues											$ 124,000
Number of customers accounted for 10% or more of consolidated revenues | Customer									0	0	1
Major Customer | Revenues | Customer Concentration Risk
Segment Reporting Disclosure [Line Items]
Percentage of sales revenues											14.00%
Contract Drilling
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs | Rigs	252								252
Total operating revenues									$ 1,430,492	$ 1,040,033	$ 543,663
Contract Drilling | Canada
Segment Reporting Disclosure [Line Items]
Total operating revenues									9,300	13,700	$ 15,600
Long-lived assets	$ 26,200				$ 52,000				$ 26,200	$ 52,000

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