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Quarterly Results of Operations (Unaudited) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2018 | Oct. 01, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  | $ 1,061,489,000 | $ 1,060,991,000 | $ 1,060,823,000 | $ 1,042,458,000 | $ 991,235,000 | $ 965,661,000 | $ 949,806,000 | $ 938,876,000 | $ 4,225,761,000 | $ 3,845,578,000 | $ 3,511,453,000
Operating income (loss) |  |  | 191,844,000 | 195,746,000 | 203,359,000 | 164,559,000 | 154,405,000 | 176,756,000 | 170,194,000 | 147,755,000 | 755,508,000 | 649,109,000 | 501,606,000
Income from Continuing Operations |  |  | 158,831,000 | 78,628,000 | 93,903,000 | 45,614,000 | 24,349,000 | 25,382,000 | 83,148,000 | 58,844,000 | 376,976,000 | 191,723,000 | 103,880,000
Income (Loss) from Discontinued Operations, Net of Tax |  |  | 0 | (11,605,000) | (360,000) | (462,000) | (2,870,000) | (1,058,000) | (2,026,000) | (337,000) | (12,427,000) | (6,291,000) | 3,353,000
Net Income (Loss) |  |  | 158,831,000 | 67,023,000 | 93,543,000 | 45,152,000 | 21,479,000 | 24,324,000 | 81,122,000 | 58,507,000 | 364,549,000 | 185,432,000 | 107,233,000
Net income (loss) attributable to Iron Mountain Incorporated |  |  | $ 158,118,000 | $ 67,148,000 | $ 93,401,000 | $ 44,684,000 | $ 22,721,000 | $ 24,345,000 | $ 78,630,000 | $ 58,125,000 | $ 363,351,000 | $ 183,821,000 | $ 104,824,000
Earnings (Losses) per Share—Basic: |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations (in dollars per share) |  |  | $ 0.55 | $ 0.28 | $ 0.33 | $ 0.16 | $ 0.09 | $ 0.10 | $ 0.31 | $ 0.22 | $ 1.31 | $ 0.71 | $ 0.41
Income (loss) from discontinued operations, net of tax (in dollars per share) |  |  | 0.00 | (0.04) | 0.00 | 0.00 | (0.01) | 0.00 | (0.01) | 0.00 | (0.04) | (0.02) | 0.01
Net income (loss) per share attributable to Iron Mountain Incorporated (in dollars per share) |  |  | 0.55 | 0.23 | 0.33 | 0.16 | 0.08 | 0.09 | 0.30 | 0.22 | 1.27 | 0.69 | 0.43
Earnings (Losses) per Share—Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations (in dollars per share) |  |  | 0.55 | 0.27 | 0.33 | 0.16 | 0.09 | 0.10 | 0.30 | 0.22 | 1.31 | 0.71 | 0.41
Income (loss) from discontinued operations, net of tax (in dollars per share) |  |  | 0.00 | (0.04) | 0.00 | 0.00 | (0.01) | 0.00 | (0.01) | 0.00 | (0.04) | (0.02) | 0.01
Net income (loss) per share attributable to Iron Mountain Incorporated (in dollars per share) |  |  | $ 0.55 | $ 0.23 | $ 0.33 | $ 0.16 | $ 0.08 | $ 0.09 | $ 0.30 | $ 0.22 | $ 1.27 | $ 0.69 | $ 0.42
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangible asset impairmentt | $ 0 | $ 0 |  |  |  |  | $ 3,011,000 |  |  |  | $ 0 | $ 3,011,000 | $ 0
Decrease in debt extinguishment expense |  |  |  |  |  |  | 18,200,000 |  |  |  |  |  |
Decrease in tax provision |  |  | $ 19,900,000 |  |  |  | $ 5,800,000 |  |  |  |  |  |
Gain related to sale of land and buildings |  |  | 54,500,000 |  |  |  |  |  |  |  |  |  |
Gain on disposal/write-down of property, plant and equipment |  |  |  |  |  |  |  |  |  |  | $ 65,658,000 | $ 766,000 | $ 898,000
Increase in gains on foreign currency transactions |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |
Initial United States Divestments | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Charge related to resolution of post-closing adjustment to Access Contingent Consideration |  |  |  | $ 11,100,000 |  |  |  |  |  |  |  |  |
Argentina Fire |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal/write-down of property, plant and equipment |  |  | $ 8,800,000 |  |  |  |  |  |  |  |  |  |

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