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Purchase of Additional Ownership Interest in Joint Ventures - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 13, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Location	Feb. 12, 2017
Business Acquisition [Line Items]
Cash consideration					$ 42,688
Revenues		$ 1,296,007	$ 1,229,591	$ 3,555,327	3,377,610
Mexico
Business Acquisition [Line Items]
Revenues		$ 32,669	$ 39,021	$ 102,866	$ 113,641
Carrier Enterprise II
Business Acquisition [Line Items]
Additional ownership interest acquired	10.00%
Cash consideration	$ 42,688
Controlling interest, ownership percentage	80.00%	80.00%		80.00%			70.00%
Carrier Enterprise II
Business Acquisition [Line Items]
Revenues						$ 545,000
Carrier Enterprise II | Northeast U.S.
Business Acquisition [Line Items]
Number of locations | Location						40
Carrier Enterprise II | Mexico
Business Acquisition [Line Items]
Number of locations | Location						14

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Additional Ownership Interest Percentage Acquired

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