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Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubful Accounts, Income Taxes, and Concentration of Credit Risk (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) bank fund $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) bank fund $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) bank fund | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Concentration Risk, Number of "Triple A" Rated Money Market Funds | fund | 0 |  | 0 |  | 12 |
Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings, Cash And Liquid Assets |  |  |  |  | 15.50% |
Income (Loss) Per Share-Basic and Diluted |  |  |  |  |  |
Income (loss) from continuing operations | $ 93,903 | $ 83,148 | $ 139,517 | $ 141,992 |  |
Less: Net Income (Loss) Attributable to Noncontrolling Interests | 142 | 2,492 | 610 | 2,874 |  |
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) | 93,761 | 80,656 | 138,907 | 139,118 |  |
Income (loss) from discontinued operations, net of tax | (360) | (2,026) | (822) | (2,363) |  |
Net income (loss) attributable to Iron Mountain Incorporated | $ 93,401 | $ 78,630 | $ 138,085 | $ 136,755 |  |
Weighted-average shares—basic | shares | 285,984,000 | 264,217,000 | 285,622,000 | 264,036,000 |  |
Effect of dilutive potential stock options (in shares) | shares | 237,708 | 395,044 | 243,636 | 428,403 |  |
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) | shares | 347,543 | 318,375 | 415,929 | 405,640 |  |
Weighted-average shares—diluted | shares | 286,569,251 | 264,930,419 | 286,281,565 | 264,870,043 |  |
Earnings (Losses) per share-basic: |  |  |  |  |  |
Income (Loss) from continuing operations (in dollars per share) | $ / shares | $ 0.33 | $ 0.31 | $ 0.49 | $ 0.53 |  |
Total (loss) income discontinued operations (in dollars per share) | $ / shares | 0.00 | (0.01) | 0.00 | (0.01) |  |
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) | $ / shares | 0.33 | 0.30 | 0.48 | 0.52 |  |
Earnings (Losses) per share-diluted: |  |  |  |  |  |
Income (Loss) from continuing operations (in dollars per share) | $ / shares | 0.33 | 0.30 | 0.49 | 0.53 |  |
Total (loss) income from discontinued operations (in dollars per share) | $ / shares | 0.00 | (0.01) | 0.00 | (0.01) |  |
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) | $ / shares | $ 0.33 | $ 0.30 | $ 0.48 | $ 0.52 |  |
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) | shares | 3,272,502 | 2,701,129 | 3,257,322 | 2,597,692 |  |
Income Taxes: |  |  |  |  |  |
Effective tax rates (as a percent) | 21.90% | 18.10% | 16.50% | 16.20% |  |
Income (Loss) From Continuing Operations Before Income Taxes, Minority Interest, and (Gain) Loss on Disposition of Real Estate | $ 120,308 | $ 99,594 | $ 167,090 | $ 167,658 |  |
Provision (Benefit) for Income Taxes | $ 26,405 | $ 18,009 | $ 27,573 | $ 27,229 |  |
Federal statutory tax rate (as a percent) |  | 35.00% | 21.00% | 35.00% | 35.00% |
Tax Matter Resolution, amount released |  |  | $ 14,000 |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  | $ 7,511 |  |
Concentrations of Credit Risk |  |  |  |  |  |
Number of global banks with cash, cash equivalent and restricted cash held on deposit | bank | 7 |  | 7 |  | 7 |
Cash and cash equivalents | $ 188,192 | $ 291,019 | $ 188,192 | $ 291,019 | $ 925,699 | $ 236,484
Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings, Non-Liquid Assets |  |  |  |  | 8.00% |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Liability |  |  |  |  | $ 186,000 |
Income Tax Reconciliation Repatriation Of Foreign Earnings, Attributable To REIT |  |  |  |  | $ 82,000 |

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