GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 1,038,057	$ 1,024,567
Accumulated Amortization	129,881	114,922
Net Value	908,176	909,645
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	8,468	8,474
Accumulated Amortization	6,258	5,688
Net Value	2,210	2,786
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	775,526	755,148
Accumulated Amortization	122,047	107,365
Net Value	653,479	647,783
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	4,343	6,062
Accumulated Amortization	951	1,313
Net Value	3,392	4,749
Amortizable intangibles | Technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	611
Accumulated Amortization	573	521
Net Value	38	90
Amortizable intangibles | Other
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	532	539
Accumulated Amortization	52	35
Net Value	480	504
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	242,777	247,933
Net Value	242,777	247,933
Indefinite lived intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,800	5,800
Net Value	$ 5,800	$ 5,800