GOODWILL AND INTANGIBLE ASSETS - Other Intangible Assets, Net, by Major Class (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 25, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Total other intangible assets, net, excluding accumulated amortization	$ 242,864	$ 196,811
Less: accumulated amortization	(41,226)	(32,272)
Other intangible assets, net	201,638	164,539
Customer Relationships [Member]
Intangible Assets [Line Items]
Other finite-lived intangible assets, gross	$ 182,158	$ 140,657
Intangible assets, weighted average useful life	10 years 73 days	10 years 2 months 12 days
Noncompete Agreements [Member]
Intangible Assets [Line Items]
Other finite-lived intangible assets, gross	$ 14,324	$ 13,413
Intangible assets, weighted average useful life	3 years 10 months 24 days	3 years 7 months 6 days
Trademarks [Member]
Intangible Assets [Line Items]
Other indefinite-lived intangible assets, gross	$ 46,382	$ 42,741