Redeemable Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2021

Noncontrolling Interest [Abstract]

Summary of Redeemable Noncontrolling Interest

The following depicts changes to the balances of the redeemable noncontrolling interests:

	Linetec		Drum		Total
(Thousands of dollars)
Balance, December 31, 2019	$	84,542	$	—	$	84,542
Net income attributable to redeemable noncontrolling interests	6,661		—		6,661
Redemption value adjustment	74,513		—		74,513
Balance, December 31, 2020	165,716		—		165,716
Redeemable noncontrolling interest acquired	—		12,562		12,562
Net income attributable to redeemable noncontrolling interests	6,416		7		6,423
Redemption value adjustment	12,016		—		12,016
Balance, December 31, 2021	$	184,148	$	12,569	$	196,717