Reportable Segments - Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Segment revenues	$ 463,526	$ 500,140
Depreciation expense	10,300	10,100
Amortization of intangibles	16,185	18,164
Severance, restructuring, and acquisition integration costs	(3,619)
Segment assets	3,179,308		$ 3,406,759
Enterprise Solutions
Segment Reporting Information [Line Items]
Segment revenues	212,213	207,083
Severance, restructuring, and acquisition integration costs	(2,550)
Industrial Solutions
Segment Reporting Information [Line Items]
Segment revenues	251,313	293,057
Severance, restructuring, and acquisition integration costs	(1,069)
Reportable Segment
Segment Reporting Information [Line Items]
Segment revenues	463,526	500,140
Segment EBITDA	60,239	76,299
Depreciation expense	10,282	10,103
Amortization of intangibles	16,185	18,164
Amortization of software development intangible assets	330	59
Severance, restructuring, and acquisition integration costs	(3,619)	0
Purchase accounting effects of acquisitions	20	0
Segment assets	972,258	979,147
Reportable Segment | Enterprise Solutions
Segment Reporting Information [Line Items]
Segment revenues	212,213	207,083
Segment EBITDA	24,712	21,635
Depreciation expense	5,081	4,805
Amortization of intangibles	5,504	4,699
Amortization of software development intangible assets	55	36
Severance, restructuring, and acquisition integration costs	(2,550)
Purchase accounting effects of acquisitions	20
Segment assets	503,658	447,707
Reportable Segment | Industrial Solutions
Segment Reporting Information [Line Items]
Segment revenues	251,313	293,057
Segment EBITDA	35,527	54,664
Depreciation expense	5,201	5,298
Amortization of intangibles	10,681	13,465
Amortization of software development intangible assets	275	23
Severance, restructuring, and acquisition integration costs	(1,069)
Purchase accounting effects of acquisitions	0
Segment assets	468,600	531,440
Affiliate revenues | Reportable Segment
Segment Reporting Information [Line Items]
Segment revenues	230	1,561
Affiliate revenues | Reportable Segment | Enterprise Solutions
Segment Reporting Information [Line Items]
Segment revenues	224	1,544
Affiliate revenues | Reportable Segment | Industrial Solutions
Segment Reporting Information [Line Items]
Segment revenues	$ 6	$ 17