Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details) - Interest Rate Swap - Designated - Cash Flow Hedge - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 28, 2015	Dec. 31, 2014	Dec. 31, 2013
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ 1,047	$ 1,020	$ 998
Interest rate swap - cash flow hedge, loss	382	488
Recurring
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge, loss	27	488
Recurring | Significant Other Observable Inputs (Level 2)
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	1,047	1,020
Recurring | Carrying Value
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ 1,047	$ 1,020