CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 178,293	$ 179,845
Restricted cash	35,112	35,110
Accounts receivable (less allowances of $23,277 and $23,206 as of December 31, 2011 and March 31, 2012, respectively)	558,357	543,467
Deferred income taxes	42,289	43,235
Prepaid expenses and other	110,654	105,537
Assets of discontinued operations	7,294	7,256
Total Current Assets	931,999	914,450
Property, Plant and Equipment:
Property, plant and equipment	4,244,184	4,232,594
Less-Accumulated depreciation	(1,841,526)	(1,825,511)
Property, Plant and Equipment, net	2,402,658	2,407,083
Other Assets, net:
Goodwill	2,282,621	2,254,268
Customer relationships and acquisition costs	416,318	410,149
Deferred financing costs	34,435	35,798
Other	18,591	19,510
Total Other Assets, net	2,751,965	2,719,725
Total Assets	6,086,622	6,041,258
Current Liabilities:
Current portion of long-term debt	63,229	73,320
Accounts payable	139,236	156,381
Accrued expenses	363,715	418,831
Deferred revenue	204,101	197,181
Liabilities of discontinued operations	7,859	3,317
Total Current Liabilities	778,140	849,030
Long-term Debt, net of current portion	3,390,447	3,280,268
Other Long-term Liabilities	57,697	53,169
Deferred Rent	97,585	97,177
Deferred Income Taxes	493,950	507,358
Commitments and Contingencies (see Note 8)
Iron Mountain Incorporated Stockholders' Equity:
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding)
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 172,140,966 shares and 171,182,398 shares as of December 31, 2011 and March 31, 2012, respectively)	1,712	1,721
Additional paid-in capital	317,492	343,603
Retained earnings	915,126	902,567
Accumulated other comprehensive items, net	25,286	(2,203)
Total Iron Mountain Incorporated Stockholders' Equity	1,259,616	1,245,688
Noncontrolling Interests	9,187	8,568
Total Equity	1,268,803	1,254,256
Total Liabilities and Equity	$ 6,086,622	$ 6,041,258