Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2016	Jun. 26, 2015	Jun. 24, 2016	Jun. 26, 2015
Net (loss) income attributable to CH2M per common share (Note 5)1:
Income allocated to preferred stockholders		$ 63		$ 77
Accrued dividends attributable to preferred stockholders	$ 3,612	55	$ 6,176	55
Preferred Stock
Net (loss) income attributable to CH2M per common share (Note 5)1:
Income allocated to preferred stockholders		63		77
Accrued dividends attributable to preferred stockholders	$ 3,612	$ 55	$ 6,176	$ 55