GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 747,898	$ 731,686
Accumulated Amortization	74,676	64,215
Net Value	673,222	667,471
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	10,079	10,993
Accumulated Amortization	5,562	5,843
Net Value	4,517	5,150
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	617,581	602,095
Accumulated Amortization	67,893	57,236
Net Value	549,688	544,859
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	4,885	4,922
Accumulated Amortization	849	712
Net Value	4,036	4,210
Amortizable intangibles | License agreements
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	720
Accumulated Amortization	364	420
Net Value	247	300
Amortizable intangibles | Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	84	89
Accumulated Amortization	8	4
Net Value	76	85
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	114,658	112,867
Net Value	$ 114,658	$ 112,867