GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 1,020,063	$ 808,133
Accumulated Amortization	109,135	88,098
Net Value	910,928	720,035
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	8,548	9,405
Accumulated Amortization	5,459	5,366
Net Value	3,089	4,039
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	749,903	670,889
Accumulated Amortization	101,927	81,271
Net Value	647,976	589,618
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,235	5,283
Accumulated Amortization	1,234	1,031
Net Value	4,001	4,252
Amortizable intangibles | Technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	611
Accumulated Amortization	495	416
Net Value	116	195
Amortizable intangibles | Other
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	555	91
Accumulated Amortization	20	14
Net Value	535	77
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	249,411	116,054
Net Value	249,411	116,054
Indefinite lived intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,800	5,800
Net Value	$ 5,800	$ 5,800