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Joint Ventures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Assets:    
Accounts receivable $ 698,477 $ 780,247
Other current assets 180,134 156,652
Property, plant and equipment, net 6,109,565 5,709,895
Other long-term assets 252,854 228,824
Total assets (1) [1] 8,401,984 8,300,288
Liabilities:    
Accounts payable 363,416 379,028
Accrued liabilities 533,044 492,787
Total liabilities (1) [1] 5,259,213 5,003,121
SANAD    
Assets:    
Cash and cash equivalents 94,496 109,445
Accounts receivable 10,580 27,690
Other current assets 10,834 8,402
Property, plant and equipment, net 130,218 250,904
Other long-term assets 23,091 20,750
Total assets (1) 269,219 417,191
Liabilities:    
Accounts payable 7,236 45,705
Accrued liabilities 2,592 8,002
Total liabilities (1) 9,828 $ 53,707
Saudi Aramco | SANAD    
Joint Ventures    
Cash contribution for joint venture 20,000  
Additional contribution amount $ 204,000  
Maturity period 25 years  
[1] The condensed consolidated balance sheet as of June 30, 2018 and December 31, 2017 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.