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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES (Balance Sheet) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract] |  |  |  |
Guarantor, ownership interest by Clean Harbors, Inc. | 100.00% |  |  |
Assets: |  |  |  |
Cash and cash equivalents | $ 319,399 | $ 306,997 | $ 184,708 | $ 246,879
Short-term marketable securities | 38,179 | 0 |  |
Intercompany receivables | 0 | 0 |  |
Accounts receivable, net | 528,924 | 496,226 |  |
Other current assets | 267,554 | 289,648 |  |
Property, plant and equipment, net | 1,587,365 | 1,611,827 |  |
Investments in subsidiaries | 0 | 0 |  |
Intercompany debt receivable | 0 | 0 |  |
Goodwill | 478,523 | 465,154 | 453,105 |
Permits and other intangibles, net | 469,128 | 498,721 |  |
Other long-term assets | 17,498 | 13,347 |  |
Total assets | 3,706,570 | 3,681,920 | 3,431,428 |
Liabilities and Stockholders' Equity: |  |  |  |
Current liabilities | 503,817 | 504,668 |  |
Intercompany payables | 0 | 0 |  |
Closure, post-closure and remedial liabilities, net | 165,723 | 166,322 |  |
Long-term obligations, less current portion | 1,625,537 | 1,633,272 |  |
Intercompany debt payable | 0 | 0 |  |
Other long-term liabilities | 223,291 | 293,417 |  |
Total liabilities | 2,518,368 | 2,597,679 |  |
Stockholders' equity | 1,188,202 | 1,084,241 | 1,096,282 | 1,262,871
Total liabilities and stockholders' equity | 3,706,570 | 3,681,920 |  |
Reportable Legal Entities | Clean Harbors, Inc. |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 51,638 | 51,417 | 11,017 | 1,006
Short-term marketable securities | 0 |  |  |
Intercompany receivables | 238,339 | 200,337 |  |
Accounts receivable, net | 0 | 0 |  |
Other current assets | 897 | 3,096 |  |
Property, plant and equipment, net | 0 | 0 |  |
Investments in subsidiaries | 3,112,547 | 2,851,571 |  |
Intercompany debt receivable | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Permits and other intangibles, net | 0 | 0 |  |
Other long-term assets | 2,084 | 2,446 |  |
Total assets | 3,405,505 | 3,108,867 |  |
Liabilities and Stockholders' Equity: |  |  |  |
Current liabilities | 16,954 | 21,805 |  |
Intercompany payables | 574,812 | 365,848 |  |
Closure, post-closure and remedial liabilities, net | 0 | 0 |  |
Long-term obligations, less current portion | 1,625,537 | 1,633,272 |  |
Intercompany debt payable | 0 | 3,701 |  |
Other long-term liabilities | 0 | 0 |  |
Total liabilities | 2,217,303 | 2,024,626 |  |
Stockholders' equity | 1,188,202 | 1,084,241 |  |
Total liabilities and stockholders' equity | 3,405,505 | 3,108,867 |  |
Reportable Legal Entities | Guarantor Subsidiaries |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 207,777 | 155,943 | 83,479 | 154,147
Short-term marketable securities | 0 |  |  |
Intercompany receivables | 590,100 | 354,836 |  |
Accounts receivable, net | 433,042 | 417,029 |  |
Other current assets | 233,602 | 234,408 |  |
Property, plant and equipment, net | 1,174,975 | 1,211,210 |  |
Investments in subsidiaries | 569,568 | 580,124 |  |
Intercompany debt receivable | 92,530 | 86,409 |  |
Goodwill | 415,641 | 412,638 |  |
Permits and other intangibles, net | 408,655 | 435,594 |  |
Other long-term assets | 12,064 | 7,582 |  |
Total assets | 4,137,954 | 3,895,773 |  |
Liabilities and Stockholders' Equity: |  |  |  |
Current liabilities | 371,135 | 366,831 |  |
Intercompany payables | 289,531 | 237,058 |  |
Closure, post-closure and remedial liabilities, net | 148,872 | 150,682 |  |
Long-term obligations, less current portion | 0 | 0 |  |
Intercompany debt payable | 21,000 | 21,000 |  |
Other long-term liabilities | 201,086 | 275,649 |  |
Total liabilities | 1,031,624 | 1,051,220 |  |
Stockholders' equity | 3,106,330 | 2,844,553 |  |
Total liabilities and stockholders' equity | 4,137,954 | 3,895,773 |  |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 59,984 | 99,637 | 90,212 | 91,726
Short-term marketable securities | 38,179 |  |  |
Intercompany receivables | 52,909 | 49,055 |  |
Accounts receivable, net | 95,882 | 79,197 |  |
Other current assets | 52,947 | 69,257 |  |
Property, plant and equipment, net | 412,390 | 400,617 |  |
Investments in subsidiaries | 0 | 0 |  |
Intercompany debt receivable | 21,000 | 24,701 |  |
Goodwill | 62,882 | 52,516 |  |
Permits and other intangibles, net | 60,473 | 63,127 |  |
Other long-term assets | 3,350 | 4,387 |  |
Total assets | 859,996 | 842,494 |  |
Liabilities and Stockholders' Equity: |  |  |  |
Current liabilities | 135,620 | 133,145 |  |
Intercompany payables | 17,005 | 1,322 |  |
Closure, post-closure and remedial liabilities, net | 16,851 | 15,640 |  |
Long-term obligations, less current portion | 0 | 0 |  |
Intercompany debt payable | 92,530 | 86,409 |  |
Other long-term liabilities | 22,205 | 18,836 |  |
Total liabilities | 284,211 | 255,352 |  |
Stockholders' equity | 575,785 | 587,142 |  |
Total liabilities and stockholders' equity | 859,996 | 842,494 |  |
Consolidating Adjustments |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Short-term marketable securities | 0 |  |  |
Intercompany receivables | (881,348) | (604,228) |  |
Accounts receivable, net | 0 | 0 |  |
Other current assets | (19,892) | (17,113) |  |
Property, plant and equipment, net | 0 | 0 |  |
Investments in subsidiaries | (3,682,115) | (3,431,695) |  |
Intercompany debt receivable | (113,530) | (111,110) |  |
Goodwill | 0 | 0 |  |
Permits and other intangibles, net | 0 | 0 |  |
Other long-term assets | 0 | (1,068) |  |
Total assets | (4,696,885) | (4,165,214) |  |
Liabilities and Stockholders' Equity: |  |  |  |
Current liabilities | (19,892) | (17,113) |  |
Intercompany payables | (881,348) | (604,228) |  |
Closure, post-closure and remedial liabilities, net | 0 | 0 |  |
Long-term obligations, less current portion | 0 | 0 |  |
Intercompany debt payable | (113,530) | (111,110) |  |
Other long-term liabilities | 0 | (1,068) |  |
Total liabilities | (1,014,770) | (733,519) |  |
Stockholders' equity | (3,682,115) | (3,431,695) |  |
Total liabilities and stockholders' equity | $ (4,696,885) | $ (4,165,214) |  |

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