Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) unit	Dec. 31, 2020 USD ($) unit
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Decrease in fair value of reporting units considered for impairment			10.00%
Goodwill	2,136,133,000	2,136,133,000	$ 2,121,014,000
Other intangible assets	403,931,000	403,931,000	$ 435,655,000
Impairment of other intangible assets	0	$ 0
Underground Utility and Infrastructure Solutions | Two Canadian Pipeline Operating Businesses
Goodwill [Line Items]
Number of reporting units at risk after cushion test | unit			2
Underground Utility and Infrastructure Solutions | Two Canadian Pipeline Operating Businesses And United States Material Handling Services
Goodwill [Line Items]
Number of reporting units at risk after cushion test | unit		3
Goodwill	101,900,000	$ 101,900,000
Other intangible assets	17,500,000	17,500,000
Underground Utility and Infrastructure Solutions | Specialized Industrial Services Business
Goodwill [Line Items]
Goodwill	303,200,000	303,200,000
Other intangible assets	$ 46,700,000	$ 46,700,000