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Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	[1]
Disaggregation of Revenue [Line Items]
Revenues	$ 926,577	$ 872,095
United States
Disaggregation of Revenue [Line Items]
Revenues	840,268	786,280
Canada
Disaggregation of Revenue [Line Items]
Revenues	52,360	51,533
Mexico
Disaggregation of Revenue [Line Items]
Revenues	$ 33,949	$ 34,282
Sales Revenue
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	100.00%	100.00%
Sales Revenue | HVAC Equipment
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	66.00%	65.00%
Sales Revenue | Other HVAC Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	29.00%	30.00%
Sales Revenue | Commercial Refrigeration Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	5.00%	5.00%
[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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