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Segment Information - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment Divisions	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment									2
Number of internal divisions | Divisions									2
Revenues	$ 3,112,218	$ 2,985,281	$ 2,656,348	$ 2,417,576	$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	$ 11,171,423	$ 9,466,478	$ 7,651,319
Property and equipment	1,276,032				1,288,602				1,276,032	1,288,602
Non-US
Segment Reporting Information [Line Items]
Revenues									2,600,000	2,480,000	$ 1,590,000
Property and equipment	$ 304,000				$ 330,400				304,000	$ 330,400
Canada
Segment Reporting Information [Line Items]
Revenues									$ 1,984,214
Percentage of foreign revenues									76.00%	79.00%	75.00%

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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