Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands		2 Months Ended	12 Months Ended
	Dec. 29, 2017 USD ($)	Dec. 29, 2017 USD ($)	Dec. 31, 2015 USD ($) assembled_workforce acquisition	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Finite-Lived Intangible Assets [Line Items]
Payments to acquire employment relationships			$ 925	$ 0	$ 0
Weighted average useful life (in years)			3 years 8 months
Amortization of acquired intangible assets			$ 9,103	$ 8,898	$ 7,909
Number of assembled workforces | assembled_workforce			2
Number of asset acquisitions | acquisition			2
Trade name and trademarks | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life			1 year
Trade name and trademarks | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life			5 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life			1 year
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life			10 years
Technology
Finite-Lived Intangible Assets [Line Items]
Useful life			7 years
Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Useful life			2 years
Payments to acquire employment relationships			$ 1,000
Term of employment required for contingency payment			2 years
Forecast | Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Contingency payment to be paid if acquired employees remain employed on anniversary	$ 100	$ 1,200