Joint Ventures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Assets:
Accounts receivable	$ 698,477	$ 756,320
Other current assets	180,134	177,604
Property, plant and equipment, net	6,109,565	5,467,870	$ 6,267,583
Other long-term assets	252,854	263,506
Total assets (1)	8,401,984	7,853,944
Liabilities:
Accounts payable	363,416	392,843
Accrued liabilities	533,044	417,912
Total liabilities (1)	5,259,213	4,698,757
SANAD
Assets:
Cash and cash equivalents	94,496	211,618
Accounts receivable	10,580	73,699
Other current assets	10,834	17,198
Property, plant and equipment, net	130,218	457,963
Other long-term assets	23,091	36,583
Total assets (1)	269,219	797,061
Liabilities:
Accounts payable	7,236	60,087
Accrued liabilities	2,592	8,530
Total liabilities (1)	9,828	$ 68,617
Saudi Aramco | SANAD
Joint Ventures
Cash contribution for joint venture	20,000
Additional contribution amount	$ 394,000
Maturity period	25 years