Restructuring and Asset Impairments - Summary of Restructuring Liability (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Restructuring Cost and Reserve [Line Items]
Charges to costs and expenses	$ 100,000	$ 0	$ 2,400,000	$ 2,000,000
North America [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0
Charges to costs and expenses	100,000	0	2,300,000	1,000,000
Cash payments			(2,300,000)
Ending balance	0		0
North America [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0
Charges to costs and expenses			2,300,000
Cash payments			(2,300,000)
Ending balance	0		0
United Kingdom [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0
Charges to costs and expenses	0	0	100,000	700,000
Cash payments			(100,000)
Ending balance	0		0
United Kingdom [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0
Charges to costs and expenses			100,000
Cash payments			(100,000)
Ending balance	$ 0		$ 0