GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	$ 2,298,632	$ 1,993,586
Accumulated Amortization	220,398	151,025
Net Value	2,078,234	1,842,561	$ 909,645
Operating permits
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	241,208	233,101
Net Value	241,208	233,101
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	480,741	426,498
Net Value	480,741	426,498
Customer relationships
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	1,539,892	1,304,388
Accumulated Amortization	210,224	144,020
Net Value	1,329,668	1,160,368
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	9,875	6,878
Accumulated Amortization	6,137	5,141
Net Value	3,738	1,737
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	7,513	3,819
Accumulated Amortization	1,540	948
Net Value	5,973	2,871
Other
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	19,403	18,902
Accumulated Amortization	2,497	916
Net Value	$ 16,906	$ 17,986