Property and Equipment - Schedule of Costs and Related Accumulated Depreciation and Amortization of Major Classes of Property (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 160,480	$ 157,400
Less: accumulated depreciation and amortization	(77,465)	(75,310)
Property and equipment, net	83,015	82,090
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,323	12,323
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	94,826	92,834
Other Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	50,548	49,890
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,783	$ 2,353