GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 173,621	$ 246,879	$ 278,644	$ 310,073
Intercompany receivables	0	0
Accounts receivable, net	684,875	557,131
Other current assets	304,821	322,423
Property, plant and equipment, net	1,562,254	1,558,834
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	452,858	452,669
Permits and other intangibles, net	534,621	530,080
Other long-term assets	33,587	36,262
Total assets	3,746,637	3,704,278
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	697,194	572,471
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	174,302	183,731
Long-term obligations	1,395,000	1,395,000
Intercompany debt payable	0	0
Other long-term liabilities	306,705	290,205
Total liabilities	2,573,201	2,441,407
Stockholders’ equity	1,173,436	1,262,871
Total liabilities and stockholders’ equity	3,746,637	3,704,278
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	4,208	1,006	1,006	1,006
Intercompany receivables	148,955	133,219
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,604,599	2,694,727
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	15,162	16,801
Total assets	2,772,924	2,845,753
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	20,758	20,820
Intercompany payables	180,029	163,361
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,395,000	1,395,000
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	1,599,488	1,582,882
Stockholders’ equity	1,173,436	1,262,871
Total liabilities and stockholders’ equity	2,772,924	2,845,753
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	80,577	154,147	193,822	235,445
Intercompany receivables	167,764	156,920
Accounts receivable, net	564,232	414,205
Other current assets	222,344	241,232
Property, plant and equipment, net	1,042,907	970,757
Investments in subsidiaries	584,040	663,191
Intercompany debt receivable	304,894	327,634
Goodwill	358,108	324,930
Permits and other intangibles, net	449,904	435,906
Other long-term assets	12,591	12,959
Total assets	3,787,361	3,701,881
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	591,678	444,059
Intercompany payables	179,685	164,231
Closure, post-closure and remedial liabilities, net	151,308	158,622
Long-term obligations	0	0
Intercompany debt payable	0	0
Other long-term liabilities	260,091	240,242
Total liabilities	1,182,762	1,007,154
Stockholders’ equity	2,604,599	2,694,727
Total liabilities and stockholders’ equity	3,787,361	3,701,881
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	88,836	91,726	$ 83,816	$ 73,622
Intercompany receivables	44,974	39,724
Accounts receivable, net	120,643	142,926
Other current assets	82,477	81,191
Property, plant and equipment, net	519,347	588,077
Investments in subsidiaries	0	0
Intercompany debt receivable	3,701	3,701
Goodwill	94,750	127,739
Permits and other intangibles, net	84,717	94,174
Other long-term assets	5,834	6,502
Total assets	1,045,279	1,175,760
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	84,758	107,592
Intercompany payables	1,979	2,271
Closure, post-closure and remedial liabilities, net	22,994	25,109
Long-term obligations	0	0
Intercompany debt payable	304,894	327,634
Other long-term liabilities	46,614	49,963
Total liabilities	461,239	512,569
Stockholders’ equity	584,040	663,191
Total liabilities and stockholders’ equity	1,045,279	1,175,760
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(361,693)	(329,863)
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,188,639)	(3,357,918)
Intercompany debt receivable	(308,595)	(331,335)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	0	0
Total assets	(3,858,927)	(4,019,116)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(361,693)	(329,863)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(308,595)	(331,335)
Other long-term liabilities	0	0
Total liabilities	(670,288)	(661,198)
Stockholders’ equity	(3,188,639)	(3,357,918)
Total liabilities and stockholders’ equity	$ (3,858,927)	$ (4,019,116)