GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 820,429	$ 808,133
Accumulated Amortization	95,451	88,098
Net Value	724,978	720,035
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	9,406	9,405
Accumulated Amortization	5,693	5,366
Net Value	3,713	4,039
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	677,856	670,889
Accumulated Amortization	88,192	81,271
Net Value	589,664	589,618
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,286	5,283
Accumulated Amortization	1,108	1,031
Net Value	4,178	4,252
Amortizable intangibles | License agreements
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	611
Accumulated Amortization	442	416
Net Value	169	195
Amortizable intangibles | Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	334	91
Accumulated Amortization	16	14
Net Value	318	77
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	121,136	116,054
Net Value	121,136	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