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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Segment Permit Phase | Dec. 31, 2011 | Dec. 31, 2010 Segment | Dec. 31, 2009 | Oct. 15, 2013
Restricted Cash [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held in escrow for worker's compensation policy | $ 35,000 |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |
Escrow deposit received |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Accounts Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable payment term |  |  |  |  |  |  |  |  |  |  | payment within 30 or 60 days from the invoice date |  |  |  |  |  |  |
Minimum period to review accounts receivable |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |
Minimum period for unbilled receivables |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible asset impairment |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  | 4,795,000 |  | 4,575,000 |  | 4,451,000 |  |  |
Capitalized Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period for construction of major projects to capitalize interest cost |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Interest costs capitalized during the period |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  |  |
Goodwill and Other Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  | 2 |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reassignment of goodwill from change in reporting unit |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [1] |  |  |  |
Goodwill | 29,186,000 | [1] |  |  |  | 29,186,000 | [1],[2] |  |  |  | 29,186,000 | [1] | 29,186,000 | [1],[2] | 15,330,000 | [1] |  |
Number of definite lived permit |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Permit capitalized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 545,000 |
Amortization period of permit |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum likelihood of tax benefit to be realized (in hundredths) |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of processing phases |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Self Insurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insurance reserve | 644,000 |  |  |  |  | 475,000 |  |  |  |  | 644,000 |  | 475,000 |  |  |  |  |
Self-insurance expenses for continuing operations |  |  |  |  |  |  |  |  |  |  | 4,388,000 |  | 3,041,000 |  | 2,896,000 |  |  |
Self insurance expenses for discontinued operations |  |  |  |  |  |  |  |  |  |  | 171,000 |  | 311,000 |  | 314,000 |  |  |
Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation gain (loss) |  |  |  |  |  |  |  |  |  |  | 1,000 |  | (3,000) |  | 0 |  |  |
Income per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (loss) income per share (in dollars per share) | $ (0.08) |  | $ (0.04) | $ (0.10) | $ (0.08) | $ 0 |  | $ 0.40 | $ 0.23 | $ (0.05) | $ (0.3) |  | $ 0.58 |  | $ 0.44 |  |  |
Diluted (loss) income per share (in dollars per share) | $ (0.08) |  | $ (0.04) | $ (0.10) | $ (0.08) | $ 0 |  | $ 0.40 | $ 0.23 | $ (0.05) | $ (0.30) |  | $ 0.58 |  | $ 0.44 |  |  |
Income (loss) per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from discontinued operations |  |  |  |  |  |  |  |  |  |  | (30,000) |  | 182,000 |  | (919,000) |  |  |
Basic income (loss) per share (in dollars per share) | $ 0.02 |  | $ (0.01) | $ 0 | $ (0.01) | $ 0.01 |  | $ (0.02) | $ 0 | $ 0.02 | $ 0 |  | $ 0.01 |  | $ (0.08) |  |  |
Diluted income (loss) per share (in dollars per share) | $ 0.02 |  | $ (0.01) | $ 0 | $ (0.01) | $ 0.01 |  | $ (0.02) | $ 0 | $ 0.02 | $ 0.00 |  | $ 0.01 |  | $ (0.08) |  |  |
Income per share from disposal of discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of discontinued operations |  |  |  |  |  | (268,000) |  | 1,777,000 | 0 | 0 | 0 | [3] | 1,509,000 | [3] | 0 | [3] |  |
Weighted average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  | 11,225,000 |  | 11,059,000 |  | 10,989,000 |  |  |
Weighted average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  | 11,225,000 |  | 11,063,000 |  | 11,006,000 |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse Stock Split Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1-for-5
Number of authorized shares of Common Stock (in shares) | 75,000,000 |  |  |  |  | 75,000,000 |  |  |  |  | 75,000,000 |  | 75,000,000 |  |  |  |  | 75,000,000
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect (in shares) |  |  |  |  |  |  |  |  |  |  | 517,000 |  | 510,000 |  | 439,000 |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect include [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential shares excluded from above weighted average share calculations due to their anti-dilutive effect (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  | 30,000 |  | 0 |  |  |
Restated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income per share from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  |  |  |  |  |  |  |  |  |  | (3,329,000) |  | 6,377,000 |  | 4,882,000 |  |  |
Basic (loss) income per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.30) |  | $ 0.58 |  | $ 0.44 |  |  |
Diluted (loss) income per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.30) |  | $ 0.58 |  | $ 0.44 |  |  |
Income (loss) per share from discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from discontinued operations |  |  |  |  |  |  |  |  |  |  | (30,000) |  | 182,000 |  | (919,000) |  |  |
Basic income (loss) per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.01 |  | $ (0.08) |  |  |
Diluted income (loss) per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.01 |  | $ (0.08) |  |  |
Income per share from disposal of discontinued operations attributable to Perma-Fix Environmental Services, Inc. common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of discontinued operations |  |  |  |  |  |  |  |  |  |  | 0 |  | 1,509,000 |  | 0 |  |  |
Basic income per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.14 |  | $ 0 |  |  |
Diluted income per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.14 |  | $ 0 |  |  |
Weighted average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  | 11,225,000 |  | 11,059,000 |  | 10,989,000 |  |  |
Potential shares exercisable under stock option plans (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  | 4,000 |  | 11,000 |  |  |
Potential shares upon exercise of warrants (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 5,000 |  |  |
Weighted average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  | 11,225,000 |  | 11,063,000 |  | 11,006,000 |  |  |
Accounts Receivable [Member] | Clauss Construction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total AR | 3,343,000 |  |  |  |  | 3,114,000 |  |  |  |  | 3,343,000 |  | 3,114,000 |  |  |  |  |
Percent of Total A/R (in hundredths) |  |  |  |  |  |  |  |  |  |  | 29.30% |  | 18.50% |  |  |  |  |
Accounts Receivable [Member] | Department of Energy ("DOE") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total AR | 1,753,000 |  |  |  |  | 2,656,000 |  |  |  |  | 1,753,000 |  | 2,656,000 |  |  |  |  |
Percent of Total A/R (in hundredths) |  |  |  |  |  |  |  |  |  |  | 15.40% |  | 15.80% |  |  |  |  |
Revenue [Member] | Federal Government [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customer |  |  |  |  |  |  |  |  |  |  | 101,533,000 |  | 99,660,000 |  | 80,275,000 |  |  |
Percentage of revenue from major customer (in hundredths) |  |  |  |  |  |  |  |  |  |  | 79.60% |  | 84.50% |  | 82.10% |  |  |
Revenue [Member] | CH Plateau Remediation Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customer |  |  |  |  |  |  |  |  |  |  | 24,652,000 |  | 59,136,000 |  | 51,929,000 |  |  |
Percentage of revenue from major customer (in hundredths) |  |  |  |  |  |  |  |  |  |  | 19.30% |  | 50.10% |  | 53.10% |  |  |
Revenue [Member] | Department of Energy ("DOE") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customer |  |  |  |  |  |  |  |  |  |  | 26,265,000 |  | 4,136,000 |  | 0 |  |  |
Percentage of revenue from major customer (in hundredths) |  |  |  |  |  |  |  |  |  |  | 20.60% |  | 3.50% |  | 0.00% |  |  |
Treatment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reassignment of goodwill from change in reporting unit |  |  | 2,488,000 |  |  |  |  |  |  |  |  |  | (1,149,000) | [1] |  |  |  |
Goodwill | 13,691,000 | [1] |  |  |  | 13,691,000 | [1] |  |  |  | 13,691,000 | [1] | 13,691,000 | [1] | 14,000,000 | [1] |  |
Reassignment of goodwill to correct initial calculation |  |  | 2,488,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHPRC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reassignment of goodwill from change in reporting unit |  |  |  |  |  | 3,637,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 3,637,000 |  |  | $ 14,840,000 |  |  |  |  |  |  | $ 14,840,000 |  |  |  |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |  |
Office Furniture And Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Office Furniture And Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Vehicles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Vehicles [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Vehicles [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Decontamination And Processing Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Decontamination And Processing Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
61-90 Days Past Due [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reserves for doubtful accounts receivable (in hundredths) |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
91-120 Days Past Due [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reserves for doubtful accounts receivable (in hundredths) |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Over 120 Days Past Due [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reserves for doubtful accounts receivable (in hundredths) |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Deemed Uncollected [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reserves for doubtful accounts receivable (in hundredths) |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
[1] | No impairment losses have been recorded.
[2] | As presented in the accompanying consolidated financial statements contained herein within this Form 10-K/A – Amendment No. 1.
[3] | Net of taxes of $1,276,000 for year ended December 31, 2011.

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