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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