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Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Divisions	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill And Intangible Assets [Line Items]
Number of internal divisions | Divisions		2
Non-cash charge for impairment of goodwill	$ 57,000		$ 57,011
Decrease in fair value of reporting units considered for impairment calculation		10.00%
Goodwill	1,868,600	$ 1,899,879	1,868,600	$ 1,603,169	$ 1,552,658
Intangible assets	$ 263,179	280,180	$ 263,179
Pipeline and Industrial Infrastructure Division Operating Units that have been Negatively Impacted by Various Factors
Goodwill And Intangible Assets [Line Items]
Goodwill		48,000
Intangible assets		$ 11,100

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