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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES (Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed consolidating statement of cash flows |  |  |
Net cash from operating activities | $ 285,698 | $ 259,624 | $ 396,383
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (167,007) | (219,384) | (257,196)
Proceeds from sale and disposal of fixed assets | 7,124 | 20,817 | 6,195
Proceeds from sale of investments | 376 | 0 | 0
Acquisitions, net of cash acquired | (49,227) | (206,915) | (94,345)
Proceeds on sale of businesses, net of transactional costs | 45,426 | 47,134 | 0
Additions to intangible assets including costs to obtain or renew permits | (1,617) | (2,831) | (5,296)
Purchases of available-for-sale securities | (38,342) | (598) | 0
Investment in subsidiaries |  | 0 |
Intercompany | 0 | 0 | 0
Intercompany debt | 0 | 0 | 0
Net cash used in investing activities | (203,267) | (361,777) | (350,642)
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | (5,940) | (3,177) | (14,630)
Proceeds from exercise of stock options | 46 | 627 | 397
Tax payments related to withholdings on vested restricted stock | (3,149) | (2,819) | (2,159)
Excess tax benefit of stock-based compensation | 0 | 1,198 | 71
Deferred financing costs paid | (5,718) | (4,031) | 0
Repurchases of common stock | (48,971) | (22,188) | (73,347)
Payments on capital leases | 0 | 0 | (511)
Principal payment on debt | (402,000) | 0 | 0
Premiums paid on early extinguishment of debt | (6,028) | 0 | 0
Issuance of senior secured notes, net of discount | 399,000 | 0 | 0
Issuance of senior unsecured notes, including premium | 0 | 250,625 | 0
Intercompany | 0 | 0 | 0
Intercompany debt | 0 | 0 | 0
Net cash (used in) from financing activities | (72,760) | 220,235 | (90,179)
Effect of exchange rate change on cash | 2,731 | 4,207 | (17,733)
Increase (decrease) in cash and cash equivalents | 12,402 | 122,289 | (62,171)
Cash and cash equivalents, beginning of year | 306,997 | 184,708 | 246,879
Cash and cash equivalents, end of year | 319,399 | 306,997 | 184,708
Guarantor Subsidiaries |  |  |
Cash flows used in investing activities: |  |  |
Proceeds from sale of investments | 0 |  |
Reportable Legal Entities | Clean Harbors, Inc. |  |  |
Condensed consolidating statement of cash flows |  |  |
Net cash from operating activities | 16,292 | 51,033 | 9,543
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | 0 | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0 | 0
Proceeds from sale of investments | 376 |  |
Acquisitions, net of cash acquired | 0 | 0 | 0
Proceeds on sale of businesses, net of transactional costs | 0 | 0 |
Additions to intangible assets including costs to obtain or renew permits | 0 | 0 | 0
Purchases of available-for-sale securities | 0 | (102) |
Investment in subsidiaries |  | (257,125) |
Intercompany | 0 | 0 | 0
Intercompany debt | 0 | 0 | 0
Net cash used in investing activities | 376 | (257,227) | 0
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | 0 | 0 | 0
Proceeds from exercise of stock options | 46 | 627 | 397
Tax payments related to withholdings on vested restricted stock | (3,149) | (2,819) | (2,159)
Excess tax benefit of stock-based compensation |  | 1,198 | 71
Deferred financing costs paid | (5,718) | (4,031) |
Repurchases of common stock | (48,971) | (22,188) | (73,347)
Payments on capital leases |  |  | 0
Principal payment on debt | (402,000) |  |
Premiums paid on early extinguishment of debt | (6,028) |  |
Issuance of senior secured notes, net of discount | 399,000 |  |
Issuance of senior unsecured notes, including premium |  | 250,625 |
Intercompany | 54,074 | 23,182 | 75,506
Intercompany debt | (3,701) | 0 | 0
Net cash (used in) from financing activities | (16,447) | 246,594 | 468
Effect of exchange rate change on cash | 0 | 0 | 0
Increase (decrease) in cash and cash equivalents | 221 | 40,400 | 10,011
Cash and cash equivalents, beginning of year | 51,417 | 11,017 | 1,006
Cash and cash equivalents, end of year | 51,638 | 51,417 | 11,017
Reportable Legal Entities | Guarantor Subsidiaries |  |  |
Condensed consolidating statement of cash flows |  |  |
Net cash from operating activities | 217,001 | 125,591 | 314,585
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (142,211) | (194,184) | (220,789)
Proceeds from sale and disposal of fixed assets | 1,979 | 12,926 | 1,447
Acquisitions, net of cash acquired | (11,427) | (196,915) | (94,345)
Proceeds on sale of businesses, net of transactional costs | 45,245 | 18,885 |
Additions to intangible assets including costs to obtain or renew permits | (1,153) | (1,749) | 0
Purchases of available-for-sale securities | 0 | 0 |
Investment in subsidiaries |  | 0 |
Intercompany | (54,074) | (23,182) | (75,506)
Intercompany debt | 0 | 63,118 | 14,272
Net cash used in investing activities | (161,641) | (321,101) | (374,921)
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | (3,526) | (3,651) | (10,129)
Proceeds from exercise of stock options | 0 | 0 | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0 | 0
Excess tax benefit of stock-based compensation |  | 0 | 0
Deferred financing costs paid | 0 | 0 |
Repurchases of common stock | 0 | 0 | 0
Payments on capital leases |  |  | (203)
Principal payment on debt | 0 |  |
Premiums paid on early extinguishment of debt | 0 |  |
Issuance of senior secured notes, net of discount | 0 |  |
Issuance of senior unsecured notes, including premium |  | 250,625 |
Intercompany | 0 | 0 | 0
Intercompany debt | 0 | 21,000 | 0
Net cash (used in) from financing activities | (3,526) | 267,974 | (10,332)
Effect of exchange rate change on cash | 0 | 0 | 0
Increase (decrease) in cash and cash equivalents | 51,834 | 72,464 | (70,668)
Cash and cash equivalents, beginning of year | 155,943 | 83,479 | 154,147
Cash and cash equivalents, end of year | 207,777 | 155,943 | 83,479
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |
Condensed consolidating statement of cash flows |  |  |
Net cash from operating activities | 52,405 | 83,000 | 72,255
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (24,796) | (25,200) | (36,407)
Proceeds from sale and disposal of fixed assets | 5,145 | 7,891 | 4,748
Proceeds from sale of investments | 0 |  |
Acquisitions, net of cash acquired | (37,800) | (10,000) | 0
Proceeds on sale of businesses, net of transactional costs | 181 | 28,249 |
Additions to intangible assets including costs to obtain or renew permits | (464) | (1,082) | (5,296)
Purchases of available-for-sale securities | (38,342) | (496) |
Investment in subsidiaries |  | 0 |
Intercompany | 0 | 0 | 0
Intercompany debt | 3,701 | (21,000) | 0
Net cash used in investing activities | (92,375) | (21,638) | (36,955)
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | (2,414) | 474 | (4,501)
Proceeds from exercise of stock options | 0 | 0 | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0 | 0
Excess tax benefit of stock-based compensation |  | 0 | 0
Deferred financing costs paid | 0 | 0 |
Repurchases of common stock | 0 | 0 | 0
Payments on capital leases |  |  | (308)
Principal payment on debt | 0 |  |
Premiums paid on early extinguishment of debt | 0 |  |
Issuance of senior secured notes, net of discount | 0 |  |
Issuance of senior unsecured notes, including premium |  | 0 |
Intercompany | 0 | 6,500 | 0
Intercompany debt | 0 | (63,118) | (14,272)
Net cash (used in) from financing activities | (2,414) | (56,144) | (19,081)
Effect of exchange rate change on cash | 2,731 | 4,207 | (17,733)
Increase (decrease) in cash and cash equivalents | (39,653) | 9,425 | (1,514)
Cash and cash equivalents, beginning of year | 99,637 | 90,212 | 91,726
Cash and cash equivalents, end of year | 59,984 | 99,637 | 90,212
Consolidating Adjustments |  |  |
Condensed consolidating statement of cash flows |  |  |
Net cash from operating activities | 0 | 0 | 0
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | 0 | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0 | 0
Proceeds from sale of investments | 0 |  |
Acquisitions, net of cash acquired | 0 | 0 | 0
Proceeds on sale of businesses, net of transactional costs | 0 | 0 |
Additions to intangible assets including costs to obtain or renew permits | 0 | 0 | 0
Purchases of available-for-sale securities | 0 | 0 |
Investment in subsidiaries |  | 257,125 |
Intercompany | 54,074 | 23,182 | 75,506
Intercompany debt | (3,701) | (42,118) | (14,272)
Net cash used in investing activities | 50,373 | 238,189 | 61,234
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | 0 | 0 | 0
Proceeds from exercise of stock options | 0 | 0 | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0 | 0
Excess tax benefit of stock-based compensation |  | 0 | 0
Deferred financing costs paid | 0 | 0 |
Repurchases of common stock | 0 | 0 | 0
Payments on capital leases |  |  | 0
Principal payment on debt | 0 |  |
Premiums paid on early extinguishment of debt | 0 |  |
Issuance of senior secured notes, net of discount | 0 |  |
Issuance of senior unsecured notes, including premium |  | (250,625) |
Intercompany | (54,074) | (29,682) | (75,506)
Intercompany debt | 3,701 | 42,118 | 14,272
Net cash (used in) from financing activities | (50,373) | (238,189) | (61,234)
Effect of exchange rate change on cash | 0 | 0 | 0
Increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Cash and cash equivalents, beginning of year | 0 | 0 | 0
Cash and cash equivalents, end of year | $ 0 | $ 0 | $ 0

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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