GOODWILL AND OTHER INTANGIBLE ASSETS - Values of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 1,008,895	$ 1,024,567
Accumulated Amortization	119,535	114,922
Net Value	889,360	909,645
Amortizable intangibles | Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	8,451	8,474
Accumulated Amortization	5,959	5,688
Net Value	2,492	2,786
Amortizable intangibles | Customer relationships
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	750,022	755,148
Accumulated Amortization	112,107	107,365
Net Value	637,915	647,783
Amortizable intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	4,265	6,062
Accumulated Amortization	880	1,313
Net Value	3,385	4,749
Amortizable intangibles | Technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	611	611
Accumulated Amortization	547	521
Net Value	64	90
Amortizable intangibles | Other
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	517	539
Accumulated Amortization	42	35
Net Value	475	504
Indefinite lived intangibles | Operating permits
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	239,229	247,933
Net Value	239,229	247,933
Indefinite lived intangibles | Tradenames
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	5,800	5,800
Net Value	$ 5,800	$ 5,800