Acquisitions - Additional Information (Details) - USD ($)						3 Months Ended								12 Months Ended
	Apr. 25, 2018	Feb. 08, 2018	May 31, 2017	Dec. 31, 2016	Jan. 07, 2016	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Severance, restructuring, and acquisition integration costs						$ 11,600,000	$ 11,700,000	$ 24,900,000	$ 20,400,000	$ 9,900,000	$ 16,700,000	$ 9,600,000	$ 6,600,000	$ 68,613,000	$ 42,790,000	$ 31,140,000
Amortization of intangibles														98,829,000	103,997,000	98,385,000
Net-Tech Technology, Inc.
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	100.00%
Acquisition price paid	$ 8,500,000
Snell Advanced Media
Business Acquisition [Line Items]
Percentage of outstanding shares acquired		100.00%
Acquisition price		$ 104,500,000
Acquisition price paid		75,200,000
Maximum earnout consideration		31,400,000
Estimated earnout consideration		29,300,000
Long-term debt acquired		19,315,000
Goodwill, Purchase Accounting Adjustments						$ 15,000,000
Fair value of acquired receivables		16,551,000
Tax Basis In Acquired Goodwill		$ 0
Post acquisition revenue of acquiree														106,300,000
Severance, restructuring, and acquisition integration costs														46,100,000
Amortization of intangibles														10,600,000
Inventory adjustment														$ 1,800,000
Snell Advanced Media | Acquisition-related Costs
Business Acquisition [Line Items]
Severance, restructuring, and acquisition integration costs															46,100,000
Amortization of intangibles															1,900,000
Inventory adjustment															1,700,000
Thinklogical Holdings LLC
Business Acquisition [Line Items]
Percentage of outstanding shares acquired			100.00%
Acquisition price paid			$ 165,800,000
Fair value of acquired receivables			4,355,000
Tax Basis In Acquired Goodwill			$ 43,300,000
Post acquisition revenue of acquiree															30,800,000
Amortization of intangibles															11,900,000
Inventory adjustment															6,100,000
Goodwill tax basis, tax deductible period														15 years
Post acquisition income (loss) before taxes of acquiree															$ (8,900,000)
Thinklogical Holdings LLC | Acquisition-related Costs
Business Acquisition [Line Items]
Amortization of intangibles																1,400,000
Inventory adjustment																6,100,000
M2 FX Limited
Business Acquisition [Line Items]
Percentage of outstanding shares acquired					100.00%
Acquisition price paid					$ 19,000,000
Estimated earnout consideration				$ 0	$ 3,200,000											3,200,000
Inventory adjustment																200,000
Benefit included in selling, general, and administrative expense																$ 3,200,000