Income Taxes - Additional Information (Detail) $ in Millions	6 Months Ended
	Jul. 01, 2017 USD ($)
Income Tax Contingency [Line Items]
Net unrecognized tax benefits	$ 4.6
Unrecognized tax benefits which would impact effective tax rate if recognized	3.1
Accrued interest related to uncertain tax positions	$ 0.2
Earliest Tax Year [Member] | State Tax Authority [Member]
Income Tax Contingency [Line Items]
Income tax years under examination	2011
Latest Tax Year [Member] | State Tax Authority [Member]
Income Tax Contingency [Line Items]
Income tax years under examination	2012