Fair Value Measurements - Summary of Changes in the Fair Value of Level 3 Contingent Consideration (Details) - Fair Value, Inputs, Level 3 $ in Thousands	6 Months Ended
	Jul. 01, 2016 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at December 31, 2015	$ 3,889
Fair value adjustments	1,427	[1]
Balance at July 1, 2016	$ 5,316

[1] In the six months ended July 1, 2016, the fair value of the contingent considerations in connection with the acquisitions of Lincoln Laser and Applimotion were increased by $0.3 million and $1.1 million, respectively, primarily due to increased actual and projected revenue performance.