Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Apr. 08, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total fair value of consideration						$ 66,300
Initial payment			$ 37,800
Consideration transferred			1,800
Transaction expenses			700
Net revenues	$ 452,045	$ 468,105	881,475	$ 906,651
Income (loss) from continuing operations before taxes	50,479	$ 58,836	99,084	$ 102,639
Truphatek
Business Acquisition [Line Items]
Noncontrolling interest					6.00%
Equity interest held			1,200
Working capital adjustment related to acquisition			400
Fair value of minority interest gain			1,000
Business Combinations 2015
Business Acquisition [Line Items]
Total fair value of consideration	40,434		40,434
Net revenues	1,800		2,600
Income (loss) from continuing operations before taxes	$ 300		$ 900
Intellectual Property | Minimum
Business Acquisition [Line Items]
Intangible asset useful life			15 years
Intellectual Property | Maximum
Business Acquisition [Line Items]
Intangible asset useful life			20 years
Customer Lists | Minimum
Business Acquisition [Line Items]
Intangible asset useful life			10 years
Customer Lists | Maximum
Business Acquisition [Line Items]
Intangible asset useful life			18 years
Non-compete Agreements
Business Acquisition [Line Items]
Intangible asset useful life			5 years