Equity-Based Compensation - Schedule of compensation expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 24, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 1,172	$ 41	$ 15,509	$ 124
Unit appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	0	0	11,762	0
Restricted Class B units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	0	41	605	124
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 1,172	$ 0	$ 3,142	$ 0