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Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) division	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Goodwill And Intangible Assets [Line Items]
Number of internal divisions | division	2
Decrease in fair value of reporting units considered for impairment calculation	10.00%
Goodwill	$ 2,002,909	$ 1,899,879	$ 1,868,600
Intangible assets	431,563	280,180
Pipeline and Industrial Infrastructure Services Division
Goodwill And Intangible Assets [Line Items]
Goodwill	652,978	$ 586,801	$ 596,073
Pipeline and Industrial Infrastructure Services Division | Material Handling Services and Midstream and Smaller-Scale Pipeline Market Reporting Units
Goodwill And Intangible Assets [Line Items]
Goodwill	48,700
Intangible assets	$ 9,100

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