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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | $ 221,469 | $ 178,827
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (127,736) | (175,348)
Proceeds from sale and disposal of fixed assets | 5,375 | 3,982
Acquisitions, net of cash acquired | (44,432) | (207,089)
Proceeds on sale of business | 46,339 | 47,134
Additions to intangible assets, including costs to obtain or renew permits | (1,348) | (1,920)
Purchases of available-for-sale securities | 0 | (598)
Proceeds from sale of investments | 376 | 0
Intercompany | 0 | 0
Intercompany debt | 0 |
Investment in subsidiaries |  | 0
Net cash used in investing activities | (121,426) | (333,839)
Cash flows used in financing activities: |  |
Change in uncashed checks | (8,657) | (7,084)
Proceeds from exercise of stock options | 46 | 230
Issuance of restricted shares, net of shares remitted | (2,321) | (2,500)
Repurchases of common stock | (24,465) | (15,869)
Deferred financing costs paid | (5,746) | (2,614)
Excess tax benefit of stock-based compensation | 0 | 21
Premiums paid on early extinguishment of debt | (6,028) | 0
Principal payment on debt | (401,000) | 0
Issuance of senior secured notes, net of discount | 399,000 | 0
Issuance of senior unsecured notes, including premium | 0 | 250,625
Intercompany | 0 | 0
Intercompany debt | 0 | 0
Net cash (used in) from financing activities | (49,171) | 222,809
Effect of exchange rate change on cash | 3,789 | 5,352
Increase (decrease) in cash and cash equivalents | 54,661 | 73,149
Cash and cash equivalents, beginning of period | 306,997 | 184,708
Cash and cash equivalents, end of period | 361,658 | 257,857
Consolidating Adjustments |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 0 | 0
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds on sale of business | 0 | 0
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Purchases of available-for-sale securities |  | 0
Proceeds from sale of investments | 0 |
Intercompany | 27,740 | 18,118
Intercompany debt | 3,701 |
Investment in subsidiaries |  | 250,625
Net cash used in investing activities | 24,039 | 268,743
Cash flows used in financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | (250,625)
Intercompany | (27,740) | (18,118)
Intercompany debt | 3,701 | 0
Net cash (used in) from financing activities | (24,039) | (268,743)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 0
Cash and cash equivalents, end of period | 0 | 0
Clean Harbors, Inc. |  |
Cash flows used in financing activities: |  |
Intercompany debt |  | 0
Clean Harbors, Inc. | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 16,196 | 43,033
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds on sale of business | 0 | 0
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Purchases of available-for-sale securities |  | (102)
Proceeds from sale of investments | 376 |
Intercompany | 0 | 0
Intercompany debt | 0 |
Investment in subsidiaries |  | (250,625)
Net cash used in investing activities | 376 | (250,727)
Cash flows used in financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options | 46 | 230
Issuance of restricted shares, net of shares remitted | (2,321) | (2,500)
Repurchases of common stock | (24,465) | (15,869)
Deferred financing costs paid | (5,746) | (2,614)
Excess tax benefit of stock-based compensation |  | 21
Premiums paid on early extinguishment of debt | (6,028) |
Principal payment on debt | (401,000) |
Issuance of senior secured notes, net of discount | 399,000 |
Issuance of senior unsecured notes, including premium |  | 250,625
Intercompany | 27,740 | 18,118
Intercompany debt | (3,701) |
Net cash (used in) from financing activities | (16,475) | 248,011
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 97 | 40,317
Cash and cash equivalents, beginning of period | 51,417 | 11,017
Cash and cash equivalents, end of period | 51,514 | 51,334
Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 169,715 | 128,182
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (105,564) | (152,836)
Proceeds from sale and disposal of fixed assets | 1,625 | 950
Acquisitions, net of cash acquired | (11,427) | (197,089)
Proceeds on sale of business | 46,158 | 18,885
Additions to intangible assets, including costs to obtain or renew permits | (1,018) | (949)
Purchases of available-for-sale securities |  | 0
Proceeds from sale of investments | 0 |
Intercompany | (27,740) | (18,118)
Intercompany debt | 0 |
Investment in subsidiaries |  | 0
Net cash used in investing activities | (97,966) | (349,157)
Cash flows used in financing activities: |  |
Change in uncashed checks | (6,140) | (6,064)
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | 250,625
Intercompany | 0 | 0
Intercompany debt | 0 | 63,118
Net cash (used in) from financing activities | (6,140) | 307,679
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 65,609 | 86,704
Cash and cash equivalents, beginning of period | 155,943 | 83,479
Cash and cash equivalents, end of period | 221,552 | 170,183
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 35,558 | 7,612
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (22,172) | (22,512)
Proceeds from sale and disposal of fixed assets | 3,750 | 3,032
Acquisitions, net of cash acquired | (33,005) | (10,000)
Proceeds on sale of business | 181 | 28,249
Additions to intangible assets, including costs to obtain or renew permits | (330) | (971)
Purchases of available-for-sale securities |  | (496)
Proceeds from sale of investments | 0 |
Intercompany | 0 | 0
Intercompany debt | (3,701) |
Investment in subsidiaries |  | 0
Net cash used in investing activities | (47,875) | (2,698)
Cash flows used in financing activities: |  |
Change in uncashed checks | (2,517) | (1,020)
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | 0
Intercompany | 0 | 0
Intercompany debt | 0 | (63,118)
Net cash (used in) from financing activities | (2,517) | (64,138)
Effect of exchange rate change on cash | 3,789 | 5,352
Increase (decrease) in cash and cash equivalents | (11,045) | (53,872)
Cash and cash equivalents, beginning of period | 99,637 | 90,212
Cash and cash equivalents, end of period | $ 88,592 | $ 36,340

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