GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 733,614	$ 731,686
Accumulated Amortization	68,932	64,215
Net Value	664,682	667,471
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	9,962	10,993
Accumulated Amortization	5,157	5,843
Net Value	4,805	5,150
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	606,925	602,095
Accumulated Amortization	62,655	57,236
Net Value	544,270	544,859
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	4,855	4,922
Accumulated Amortization	776	712
Net Value	4,079	4,210
Amortizable intangibles | License agreements
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	720
Accumulated Amortization	338	420
Net Value	273	300
Amortizable intangibles | Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	83	89
Accumulated Amortization	6	4
Net Value	77	85
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	111,178	112,867
Net Value	$ 111,178	$ 112,867