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Derivative Instruments and Hedging Activities (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Foreign exchange contracts
USD ($)
Mar. 31, 2011
Foreign exchange contracts
USD ($)
Mar. 31, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars:British pounds sterling
USD ($)
Mar. 31, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars:British pounds sterling
GBP (£)
Mar. 31, 2012
Iron Mountain Australia Pty Ltd
U.S. dollars:British pounds sterling
USD ($)
Mar. 31, 2012
Iron Mountain Australia Pty Ltd
U.S. dollars:British pounds sterling
AUD
Derivative Instruments and Hedging Activities              
Percent of debt portfolio with fixed interest rates (as a percent) 75.00%            
Derivative instruments              
Notional amount of outstanding forward contracts, purchases       $ 195,851   $ 77,415  
Notional amount of outstanding forward contracts, sales         125,000   75,000
Net cash disbursements (receipts) from foreign currency forward contracts   $ 1,503 $ 3,625