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Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 1,296,007	$ 1,229,591	$ 3,555,327	$ 3,377,610
United States
Disaggregation of Revenue [Line Items]
Revenues	1,176,087	1,114,162	3,233,731	3,064,181
Canada
Disaggregation of Revenue [Line Items]
Revenues	87,251	76,408	218,730	199,788
Mexico
Disaggregation of Revenue [Line Items]
Revenues	$ 32,669	$ 39,021	$ 102,866	$ 113,641
Sales Revenue
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue | HVAC Equipment
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	68.00%	68.00%	68.00%	67.00%
Sales Revenue | Other HVAC Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	28.00%	27.00%	28.00%	28.00%
Sales Revenue | Commercial Refrigeration Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	4.00%	5.00%	4.00%	5.00%

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