Consolidated Ventures - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Variable Interest Entity [Line Items]
Revenues	$ 748,567	$ 617,253
Cost of revenues	566,666	465,208
Selling, general and administrative expenses	145,291	137,326
Total operating expenses	724,172	610,581
Program profit	24,395	6,672
Other loss, net	1,801	785
Net income (loss)	13,384	25,984
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Revenues	91,527	87,191
Cost of revenues	75,111	68,525
Selling, general and administrative expenses	17,497	18,017
Total operating expenses	92,608	86,542
Program profit	(1,081)	649
Other loss, net	(225)	(1,049)
Net income (loss)	$ (1,306)	$ (400)