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Segment Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment division	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Number of internal divisions | division			2
Revenues	$ 2,985,281	$ 2,609,307	$ 8,059,205	$ 6,987,851
Property and equipment	1,350,894		1,350,894		$ 1,288,602
Canada
Segment Reporting Information [Line Items]
Revenues	522,618		1,376,149
Foreign Operations
Segment Reporting Information [Line Items]
Revenues	667,600	$ 653,100	1,840,000	$ 1,830,000
Property and equipment	$ 321,600		$ 321,600		$ 330,400
Foreign Operations | Canada
Segment Reporting Information [Line Items]
Percentage of foreign revenues	78.00%	80.00%	75.00%	81.00%

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Number of internal divisions.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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