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Utility Infrastructure Services Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2018
Noncontrolling Interest [Abstract]  
Summary of Redeemable Noncontrolling Interest
The following depicts changes to the balance of the redeemable noncontrolling interest between the indicated periods.
 
Redeemable
Noncontrolling
Interest
(Thousands of dollars):
 
Balance, December 31, 2016
$
22,590

Net Income (loss) attributable to redeemable noncontrolling interest
248

Foreign currency exchange translation adjustment
11

Centuri distribution to redeemable noncontrolling interest
(204
)
Adjustment to redemption value
355

Redemption of Centuri shares from noncontrolling parties
(23,000
)
Balance, December 31, 2017
—

Redeemable noncontrolling interest acquired
81,659

Net income attributable to redeemable noncontrolling interest
172

Balance, December 31, 2018
$
81,831