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Derivative Instruments and Hedging Activities (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Foreign exchange contracts
USD ($)
Sep. 30, 2011
Foreign exchange contracts
USD ($)
Sep. 30, 2012
Foreign exchange contracts
USD ($)
Sep. 30, 2011
Foreign exchange contracts
USD ($)
Sep. 30, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars: British pounds sterling
USD ($)
Sep. 30, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars: British pounds sterling
GBP (£)
Sep. 30, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars: Australian dollars
USD ($)
Sep. 30, 2012
Iron Mountain Europe Limited ("IME")
U.S. dollars: Australian dollars
AUD
Derivative Instruments and Hedging Activities                  
Percent of debt portfolio with fixed interest rates 75.00%                
Derivative instruments                  
Notional amount of outstanding forward contracts, purchases           $ 197,913   $ 75,900  
Notional amount of outstanding forward contracts, sales             125,000   75,000
Net cash disbursements (receipts) from foreign currency forward contracts   $ (4) $ (68) $ 3,783 $ 9,116