Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 1,332,743	$ 1,275,924	$ 2,259,320	$ 2,148,019
United States
Disaggregation of Revenue [Line Items]
Revenues	1,217,376	1,163,739	2,057,644	1,950,019
Canada
Disaggregation of Revenue [Line Items]
Revenues	79,119	71,847	131,479	123,380
Mexico
Disaggregation of Revenue [Line Items]
Revenues	$ 36,248	$ 40,338	$ 70,197	$ 74,620
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%	67.00%	67.00%	66.00%
Sales Revenue | Other HVAC Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	28.00%	28.00%	29.00%	29.00%
Sales Revenue | Commercial Refrigeration Products
Disaggregation of Revenue [Line Items]
Revenues from product lines, percentage	4.00%	5.00%	4.00%	5.00%