Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Jan. 20, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Fair value of the consideration at the date of acquisition				$ 66,300,000
Net revenues	429,430,000	438,546,000
Income (loss) from continuing operations before taxes	48,605,000	43,803,000
Human Medics
Business Acquisition [Line Items]
Fair value of the consideration at the date of acquisition			8,900,000
Initial payment			7,400,000
Business Combination, Consideration Transferred, Liabilities Incurred			1,800,000
Working capital adjustment related to acquisition	300,000
Transaction expenses	$ 300,000