Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 468,019	$ 438,909	$ 1,323,641	$ 1,165,163
Operating income (loss)	18,947	12,783	35,888	43,280
Intersegment revenue elimination
Segment Reporting Information [Line Items]
Revenue	(415)	0	(1,478)	0
All Other
Segment Reporting Information [Line Items]
Operating income (loss)	(174)	(1,633)	(3,954)	(3,924)
Lawson
Segment Reporting Information [Line Items]
Revenue	117,953	114,477	357,204	358,903
Lawson | Operating Segments
Segment Reporting Information [Line Items]
Revenue	117,957	114,477	357,261	358,903
Operating income (loss)	726	10,643	10,962	27,358
Lawson | Intersegment revenue elimination
Segment Reporting Information [Line Items]
Revenue	4	0	57	0
TestEquity
Segment Reporting Information [Line Items]
Revenue	195,210	207,657	579,721	451,082
TestEquity | Operating Segments
Segment Reporting Information [Line Items]
Revenue	195,244	207,657	579,874	451,082
Operating income (loss)	4,329	(5,027)	(1,062)	(8,183)
TestEquity | Intersegment revenue elimination
Segment Reporting Information [Line Items]
Revenue	34	0	153	0
Gexpro Services
Segment Reporting Information [Line Items]
Revenue	115,764	103,232	320,658	312,523
Gexpro Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	116,141	103,232	321,926	312,523
Operating income (loss)	11,543	7,332	25,096	23,484
Gexpro Services | Intersegment revenue elimination
Segment Reporting Information [Line Items]
Revenue	377	0	1,268	0
Canada Branch Division
Segment Reporting Information [Line Items]
Revenue	39,092	13,543	66,058	42,655
Canada Branch Division | Operating Segments
Segment Reporting Information [Line Items]
Revenue	39,092	13,543	66,058	42,655
Operating income (loss)	2,523	$ 1,468	$ 4,846	$ 4,545
Canada Branch Division | Intersegment revenue elimination
Segment Reporting Information [Line Items]
Revenue	$ 0