Joint Ventures (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Sep. 30, 2019	Dec. 31, 2018
Assets:
Accounts receivable			$ 613,527	$ 756,320
Other current assets			153,723	177,604
Property, plant and equipment, net			5,152,236	5,467,870
Other long-term assets			297,189	263,506
Total assets (1)	[1]		7,273,497	7,853,944
Liabilities:
Accounts payable			364,658	392,843
Accrued liabilities			279,181	417,912
Total liabilities (1)	[1]		4,512,393	4,698,757
Saudi Aramco | SANAD
Joint Ventures
Cash contribution for joint venture		$ 20,000
Additional contribution amount		$ 394,000
Maturity period		25 years
SANAD
Assets:
Cash and cash equivalents			273,417	211,618
Accounts receivable			76,836	73,699
Other current assets			20,153	17,198
Property, plant and equipment, net			440,794	457,963
Other long-term assets			15,254	36,583
Total assets (1)			826,454	797,061
Liabilities:
Accounts payable			67,000	60,087
Accrued liabilities			17,064	8,530
Total liabilities (1)			$ 84,064	$ 68,617

[1] The condensed consolidated balance sheet as of September 30, 2019 and December 31, 2018 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.