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Supplemental Disclosures of Cash Flow Information - Summary of Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Supplemental cash flow disclosures:    
Cash paid for income taxes, net of cash received $ 6,045 $ 3,905
Cash paid for interest, net of cash received 12,477 13,928
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating expenses 18,575  
Operating cash flows from finance leases 65  
ROU assets obtained in exchange for lease liabilities:    
Operating leases 154,330  
Finance leases 1,820  
Other non-cash investing and financing activities:    
Convertible notes issued for acquisitions 4,000 37,015
Contingent earn-out liabilities for acquisitions $ 7,929 $ 767