Income Taxes - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 26, 2015 USD ($)
Income Tax Contingency [Line Items]
Net unrecognized tax benefits	$ 1.6
Unrecognized tax benefits which would impact effective tax rate if recognized	1.1
Accrued interest related to uncertain tax positions	$ 0.2
Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Income tax examination by the Internal Revenue service	2011
Earliest Tax Year [Member] | State Tax Authority [Member]
Income Tax Contingency [Line Items]
Income tax years under examination	2009
Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Income tax examination by the Internal Revenue service	2012
Latest Tax Year [Member] | State Tax Authority [Member]
Income Tax Contingency [Line Items]
Income tax years under examination	2012