GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 802,991	$ 731,686
Accumulated Amortization	82,180	64,215
Net Value	720,811	667,471
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	10,189	10,993
Accumulated Amortization	5,945	5,843
Net Value	4,244	5,150
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	664,295	602,095
Accumulated Amortization	74,893	57,236
Net Value	589,402	544,859
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,058	4,922
Accumulated Amortization	941	712
Net Value	4,117	4,210
Amortizable intangibles | License agreements
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	720
Accumulated Amortization	390	420
Net Value	221	300
Amortizable intangibles | Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	89	89
Accumulated Amortization	11	4
Net Value	78	85
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	116,949	112,867
Net Value	116,949	112,867
Indefinite lived intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,800	0
Net Value	$ 5,800	$ 0