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Schedule III Real Estate and Accumulated Depreciation - Real Estate and Accumulated Depreciation, by Property (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Initial Costs to Company        
Encumbrances $ 30,310,000      
Land 153,258,000      
Buildings and Improvements 1,788,637,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 84,091,000      
Buildings and Improvements 7,829,825,000      
Total Costs        
Land 237,349,000      
Buildings and Improvements 9,618,462,000      
Accumulated Depreciation (3,175,972,000) $ (2,595,648,000) $ (2,242,345,000) $ (1,904,311,000)
Taxable basis in aggregate initial cost 11,890,862,000      
Operating Lease [Member]        
Total Costs        
Initial cost 0      
Americas | AT1 Atlanta [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 120,368,000      
Total Costs        
Land 0      
Buildings and Improvements 120,368,000      
Accumulated Depreciation (33,293,000)      
Americas | AT2 Atlanta [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 41,845,000      
Total Costs        
Land 0      
Buildings and Improvements 41,845,000      
Accumulated Depreciation (16,871,000)      
Americas | AT3 Atlanta [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,935,000      
Total Costs        
Land 0      
Buildings and Improvements 3,935,000      
Accumulated Depreciation (1,257,000)      
Americas | BO1 BOSTON (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 11,332,000      
Total Costs        
Land 0      
Buildings and Improvements 11,332,000      
Accumulated Depreciation (5,999,000)      
Americas | CH1 CHICAGO (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 155,387,000      
Total Costs        
Land 0      
Buildings and Improvements 155,387,000      
Accumulated Depreciation (99,289,000)      
Americas | CH2 CHICAGO (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 104,108,000      
Total Costs        
Land 0      
Buildings and Improvements 104,108,000      
Accumulated Depreciation (48,677,000)      
Americas | CH3 CHICAGO (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 9,759,000      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 351,000      
Buildings and Improvements 229,398,000      
Total Costs        
Land 10,110,000      
Buildings and Improvements 229,398,000      
Accumulated Depreciation (88,929,000)      
Americas | CH4 CHICAGO (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 21,566,000      
Total Costs        
Land 0      
Buildings and Improvements 21,566,000      
Accumulated Depreciation (8,181,000)      
Americas | DA1 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 73,407,000      
Total Costs        
Land 0      
Buildings and Improvements 73,407,000      
Accumulated Depreciation (46,642,000)      
Americas | DA2 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 78,681,000      
Total Costs        
Land 0      
Buildings and Improvements 78,681,000      
Accumulated Depreciation (17,561,000)      
Americas | DA3 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 85,099,000      
Total Costs        
Land 0      
Buildings and Improvements 85,099,000      
Accumulated Depreciation (25,993,000)      
Americas | DA4 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 17,421,000      
Total Costs        
Land 0      
Buildings and Improvements 17,421,000      
Accumulated Depreciation (7,702,000)      
Americas | DA6 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 20,522,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 83,115,000      
Total Costs        
Land 0      
Buildings and Improvements 103,637,000      
Accumulated Depreciation (11,130,000)      
Americas | DA7 Dallas [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 26,431,000      
Total Costs        
Land 0      
Buildings and Improvements 26,431,000      
Accumulated Depreciation (2,351,000)      
Americas | DC1 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,120,000      
Total Costs        
Land 0      
Buildings and Improvements 5,120,000      
Accumulated Depreciation (363,000)      
Americas | DC2 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 5,047,000      
Buildings and Improvements 153,115,000      
Total Costs        
Land 5,047,000      
Buildings and Improvements 153,115,000      
Accumulated Depreciation (126,299,000)      
Americas | DC3 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 37,451,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 52,846,000      
Total Costs        
Land 0      
Buildings and Improvements 90,297,000      
Accumulated Depreciation (46,073,000)      
Americas | DC4 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 1,906,000      
Buildings and Improvements 7,272,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 71,942,000      
Total Costs        
Land 1,906,000      
Buildings and Improvements 79,214,000      
Accumulated Depreciation (46,128,000)      
Americas | DC5 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 1,429,000      
Buildings and Improvements 4,983,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 88,407,000      
Total Costs        
Land 1,429,000      
Buildings and Improvements 93,390,000      
Accumulated Depreciation (52,407,000)      
Americas | DC6 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 1,429,000      
Buildings and Improvements 5,082,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 86,711,000      
Total Costs        
Land 1,429,000      
Buildings and Improvements 91,793,000      
Accumulated Depreciation (35,116,000)      
Americas | DC7 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 20,605,000      
Total Costs        
Land 0      
Buildings and Improvements 20,605,000      
Accumulated Depreciation (10,099,000)      
Americas | DC8 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,186,000      
Total Costs        
Land 0      
Buildings and Improvements 5,186,000      
Accumulated Depreciation (4,614,000)      
Americas | DC10 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 44,601,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 70,790,000      
Total Costs        
Land 0      
Buildings and Improvements 115,391,000      
Accumulated Depreciation (30,595,000)      
Americas | DC11 WASHINGTON, DC (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 1,429,000      
Buildings and Improvements 5,082,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 165,021,000      
Total Costs        
Land 1,429,000      
Buildings and Improvements 170,103,000      
Accumulated Depreciation (20,495,000)      
Americas | DE1 DENVER (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 9,978,000      
Total Costs        
Land 0      
Buildings and Improvements 9,978,000      
Accumulated Depreciation (5,968,000)      
Americas | LA1 LOS ANGELES [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 110,624,000      
Total Costs        
Land 0      
Buildings and Improvements 110,624,000      
Accumulated Depreciation (60,332,000)      
Americas | LA2 LOS ANGELES [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 11,861,000      
Total Costs        
Land 0      
Buildings and Improvements 11,861,000      
Accumulated Depreciation (9,870,000)      
Americas | LA3 EL SEGUNDO [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 34,727,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 3,959,000      
Buildings and Improvements 21,931,000      
Total Costs        
Land 3,959,000      
Buildings and Improvements 56,658,000      
Accumulated Depreciation (42,651,000)      
Americas | LA4 EL SEGUNDO [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 19,333,000      
Buildings and Improvements 137,630,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 28,247,000      
Total Costs        
Land 19,333,000      
Buildings and Improvements 165,877,000      
Accumulated Depreciation (60,398,000)      
Americas | MI2 MIAMI (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 22,239,000      
Total Costs        
Land 0      
Buildings and Improvements 22,239,000      
Accumulated Depreciation (10,570,000)      
Americas | MI3 MIAMI (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 29,573,000      
Total Costs        
Land 0      
Buildings and Improvements 29,573,000      
Accumulated Depreciation (7,983,000)      
Americas | NY1 NEWARK [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 79,857,000      
Total Costs        
Land 0      
Buildings and Improvements 79,857,000      
Accumulated Depreciation (42,647,000)      
Americas | NY2 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 17,859,000      
Buildings and Improvements 194,181,000      
Total Costs        
Land 17,859,000      
Buildings and Improvements 194,181,000      
Accumulated Depreciation (120,724,000)      
Americas | NY4 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 330,754,000      
Total Costs        
Land 0      
Buildings and Improvements 330,754,000      
Accumulated Depreciation (153,480,000)      
Americas | NY5 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 243,296,000      
Total Costs        
Land 0      
Buildings and Improvements 243,296,000      
Accumulated Depreciation (38,838,000)      
Americas | NY6 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 73,266,000      
Total Costs        
Land 0      
Buildings and Improvements 73,266,000      
Accumulated Depreciation (5,587,000)      
Americas | NY7 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 24,660,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 138,865,000      
Total Costs        
Land 0      
Buildings and Improvements 163,525,000      
Accumulated Depreciation (88,677,000)      
Americas | NY8 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 12,159,000      
Total Costs        
Land 0      
Buildings and Improvements 12,159,000      
Accumulated Depreciation (6,118,000)      
Americas | NY9 NEW YORK CITY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 53,840,000      
Total Costs        
Land 0      
Buildings and Improvements 53,840,000      
Accumulated Depreciation (28,065,000)      
Americas | PH1 PHILADELPHIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 43,979,000      
Total Costs        
Land 0      
Buildings and Improvements 43,979,000      
Accumulated Depreciation (10,365,000)      
Americas | SE2 SEATTLE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 29,242,000      
Total Costs        
Land 0      
Buildings and Improvements 29,242,000      
Accumulated Depreciation (19,757,000)      
Americas | SE3 SEATTLE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 1,760,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 94,947,000      
Total Costs        
Land 0      
Buildings and Improvements 96,707,000      
Accumulated Depreciation (22,692,000)      
Americas | SV1 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 15,545,000      
Buildings and Improvements 159,286,000      
Total Costs        
Land 15,545,000      
Buildings and Improvements 159,286,000      
Accumulated Depreciation (104,600,000)      
Americas | SV2 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 147,154,000      
Total Costs        
Land 0      
Buildings and Improvements 147,154,000      
Accumulated Depreciation (68,545,000)      
Americas | SV3 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 43,738,000      
Total Costs        
Land 0      
Buildings and Improvements 43,738,000      
Accumulated Depreciation (38,220,000)      
Americas | SV4 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 25,941,000      
Total Costs        
Land 0      
Buildings and Improvements 25,941,000      
Accumulated Depreciation (19,003,000)      
Americas | SV5 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 6,238,000      
Buildings and Improvements 98,991,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 88,737,000      
Total Costs        
Land 6,238,000      
Buildings and Improvements 187,728,000      
Accumulated Depreciation (43,544,000)      
Americas | SV6 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 15,585,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 21,811,000      
Total Costs        
Land 0      
Buildings and Improvements 37,396,000      
Accumulated Depreciation (22,079,000)      
Americas | SV8 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 48,939,000      
Total Costs        
Land 0      
Buildings and Improvements 48,939,000      
Accumulated Depreciation (21,363,000)      
Americas | SV12 SILICON VALLEY (METRO) [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 20,535,000      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land (222,000)      
Buildings and Improvements 2,277,000      
Total Costs        
Land 20,313,000      
Buildings and Improvements 2,277,000      
Accumulated Depreciation 0      
Americas | TR1 TORONTO, CANADA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 90,158,000      
Total Costs        
Land 0      
Buildings and Improvements 90,158,000      
Accumulated Depreciation (19,895,000)      
Americas | TR2 TORONTO, CANADA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 21,113,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 76,387,000      
Total Costs        
Land 0      
Buildings and Improvements 97,500,000      
Accumulated Depreciation (7,133,000)      
Americas | RJ1 RIO DE JANEIRO, BRAZIL [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 26,361,000      
Total Costs        
Land 0      
Buildings and Improvements 26,361,000      
Accumulated Depreciation (17,933,000)      
Americas | RJ2 RIO DE JANEIRO, BRAZIL [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 2,012,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 34,237,000      
Total Costs        
Land 0      
Buildings and Improvements 36,249,000      
Accumulated Depreciation (10,145,000)      
Americas | SP1 SÃO PAULO, BRAZIL [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 10,188,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 23,181,000      
Total Costs        
Land 0      
Buildings and Improvements 33,369,000      
Accumulated Depreciation (19,816,000)      
Americas | SP2 SÃO PAULO, BRAZIL [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 73,615,000      
Total Costs        
Land 0      
Buildings and Improvements 73,615,000      
Accumulated Depreciation (33,839,000)      
Americas | OTHERS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 52,630,000      
Buildings and Improvements 18,709,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 934,000      
Buildings and Improvements 185,212,000      
Total Costs        
Land 53,564,000      
Buildings and Improvements 203,921,000      
Accumulated Depreciation (2,202,000)      
EMEA | OTHERS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,019,000      
Total Costs        
Land 0      
Buildings and Improvements 3,019,000      
Accumulated Depreciation (1,502,000)      
EMEA | AM1 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 71,764,000      
Total Costs        
Land 0      
Buildings and Improvements 71,764,000      
Accumulated Depreciation (23,787,000)      
EMEA | AM2 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 53,661,000      
Total Costs        
Land 0      
Buildings and Improvements 53,661,000      
Accumulated Depreciation (17,868,000)      
EMEA | AM3 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 27,099,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 92,654,000      
Total Costs        
Land 0      
Buildings and Improvements 119,753,000      
Accumulated Depreciation (22,758,000)      
EMEA | AM5 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 92,199,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,029,000      
Total Costs        
Land 0      
Buildings and Improvements 93,228,000      
Accumulated Depreciation (5,838,000)      
EMEA | AM6 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 6,616,000      
Buildings and Improvements 50,876,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,872,000      
Total Costs        
Land 6,616,000      
Buildings and Improvements 54,748,000      
Accumulated Depreciation (2,691,000)      
EMEA | AM7 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 7,397,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 363,000      
Total Costs        
Land 0      
Buildings and Improvements 7,760,000      
Accumulated Depreciation (973,000)      
EMEA | AM8 AMSTERDAM, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 9,291,000      
Total Costs        
Land 0      
Buildings and Improvements 9,291,000      
Accumulated Depreciation (1,677,000)      
EMEA | DB1 DUBLIN, IRELAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,852,000      
Total Costs        
Land 0      
Buildings and Improvements 1,852,000      
Accumulated Depreciation (164,000)      
EMEA | DB2 DUBLIN, IRELAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 12,460,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 671,000      
Total Costs        
Land 0      
Buildings and Improvements 13,131,000      
Accumulated Depreciation (1,706,000)      
EMEA | DB3 DUBLIN, IRELAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 3,334,000      
Buildings and Improvements 54,387,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,507,000      
Total Costs        
Land 3,334,000      
Buildings and Improvements 57,894,000      
Accumulated Depreciation (3,208,000)      
EMEA | DB4 DUBLIN, IRELAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 26,875,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 9,899,000      
Total Costs        
Land 0      
Buildings and Improvements 36,774,000      
Accumulated Depreciation (1,163,000)      
EMEA | DU1 DÜSSELDORF, GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 21,330,000      
Total Costs        
Land 0      
Buildings and Improvements 21,330,000      
Accumulated Depreciation (17,813,000)      
EMEA | DX1 DUBAI, UNITED ARAB EMIRATES [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 45,710,000      
Total Costs        
Land 0      
Buildings and Improvements 45,710,000      
Accumulated Depreciation (5,501,000)      
EMEA | EN1 ENSCHEDE, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 22,408,000      
Total Costs        
Land 0      
Buildings and Improvements 22,408,000      
Accumulated Depreciation (13,720,000)      
EMEA | FR1 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,173,000      
Total Costs        
Land 0      
Buildings and Improvements 7,173,000      
Accumulated Depreciation (6,792,000)      
EMEA | FR2 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 11,212,000      
Buildings and Improvements 198,157,000      
Total Costs        
Land 11,212,000      
Buildings and Improvements 198,157,000      
Accumulated Depreciation (73,449,000)      
EMEA | FR3 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 1,967,000      
Buildings and Improvements 4,679,000      
Total Costs        
Land 1,967,000      
Buildings and Improvements 4,679,000      
Accumulated Depreciation (1,178,000)      
EMEA | FR4 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 11,578,000      
Buildings and Improvements 9,307,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 51,650,000      
Total Costs        
Land 11,578,000      
Buildings and Improvements 60,957,000      
Accumulated Depreciation (14,570,000)      
EMEA | FR5 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 30,310,000      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 3,716,000      
Buildings and Improvements 109,540,000      
Total Costs        
Land 3,716,000      
Buildings and Improvements 109,540,000      
Accumulated Depreciation (20,552,000)      
EMEA | FR7 FRANKFURT (METRO), GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 43,634,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,035,000      
Total Costs        
Land 0      
Buildings and Improvements 44,669,000      
Accumulated Depreciation (4,492,000)      
EMEA | GV1 GENEVA (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,846,000      
Total Costs        
Land 0      
Buildings and Improvements 5,846,000      
Accumulated Depreciation (4,232,000)      
EMEA | GV2 GENEVA (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 21,282,000      
Total Costs        
Land 0      
Buildings and Improvements 21,282,000      
Accumulated Depreciation (13,709,000)      
EMEA | HE1 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 2,732,000      
Total Costs        
Land 0      
Buildings and Improvements 2,732,000      
Accumulated Depreciation (632,000)      
EMEA | HE2 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,445,000      
Total Costs        
Land 0      
Buildings and Improvements 1,445,000      
Accumulated Depreciation (524,000)      
EMEA | HE3 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 8,765,000      
Total Costs        
Land 0      
Buildings and Improvements 8,765,000      
Accumulated Depreciation (2,118,000)      
EMEA | HE4 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 29,092,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,785,000      
Total Costs        
Land 0      
Buildings and Improvements 32,877,000      
Accumulated Depreciation (2,824,000)      
EMEA | HE5 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 7,564,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 64,000      
Total Costs        
Land 0      
Buildings and Improvements 7,628,000      
Accumulated Depreciation (1,019,000)      
EMEA | HE6 HELSINKI (METRO), FINLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 17,204,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 10,067,000      
Total Costs        
Land 0      
Buildings and Improvements 27,271,000      
Accumulated Depreciation (540,000)      
EMEA | IS1 ISTANBUL (METRO), TURKEY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,046,000      
Total Costs        
Land 0      
Buildings and Improvements 7,046,000      
Accumulated Depreciation (2,126,000)      
EMEA | LD1 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 2,352,000      
Total Costs        
Land 0      
Buildings and Improvements 2,352,000      
Accumulated Depreciation (2,154,000)      
EMEA | LD3 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 14,864,000      
Total Costs        
Land 0      
Buildings and Improvements 14,864,000      
Accumulated Depreciation (9,975,000)      
EMEA | LD4 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 23,044,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 56,232,000      
Total Costs        
Land 0      
Buildings and Improvements 79,276,000      
Accumulated Depreciation (30,704,000)      
EMEA | LD5 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 16,412,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 162,639,000      
Total Costs        
Land 0      
Buildings and Improvements 179,051,000      
Accumulated Depreciation (51,491,000)      
EMEA | LD6 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 103,276,000      
Total Costs        
Land 0      
Buildings and Improvements 103,276,000      
Accumulated Depreciation (6,038,000)      
EMEA | LD8 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 107,544,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 4,834,000      
Total Costs        
Land 0      
Buildings and Improvements 112,378,000      
Accumulated Depreciation (7,598,000)      
EMEA | LD9 LONDON (METRO), UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 181,431,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,667,000      
Total Costs        
Land 0      
Buildings and Improvements 183,098,000      
Accumulated Depreciation (11,741,000)      
EMEA | MA1 MANCHESTER, UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 4,254,000      
Total Costs        
Land 0      
Buildings and Improvements 4,254,000      
Accumulated Depreciation (797,000)      
EMEA | MA2 MANCHESTER, UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 6,619,000      
Total Costs        
Land 0      
Buildings and Improvements 6,619,000      
Accumulated Depreciation (952,000)      
EMEA | MA3 MANCHESTER, UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 44,931,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 316,000      
Total Costs        
Land 0      
Buildings and Improvements 45,247,000      
Accumulated Depreciation (4,305,000)      
EMEA | MA4 MANCHESTER, UNITED KINGDOM [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 6,697,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 65,000      
Total Costs        
Land 0      
Buildings and Improvements 6,762,000      
Accumulated Depreciation (748,000)      
EMEA | ML1 MILAN (METRO), ITALY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 806,000      
Total Costs        
Land 0      
Buildings and Improvements 806,000      
Accumulated Depreciation (742,000)      
EMEA | ML2 MILAN (METRO), ITALY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,650,000      
Total Costs        
Land 0      
Buildings and Improvements 5,650,000      
Accumulated Depreciation (2,676,000)      
EMEA | ML3 MILAN (METRO), ITALY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 11,937,000      
Total Costs        
Land 0      
Buildings and Improvements 11,937,000      
Accumulated Depreciation (5,373,000)      
EMEA | ML4 MILAN (METRO), ITALY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 6,870,000      
Total Costs        
Land 0      
Buildings and Improvements 6,870,000      
Accumulated Depreciation (1,346,000)      
EMEA | MU1 MUNICH, GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 14,818,000      
Total Costs        
Land 0      
Buildings and Improvements 14,818,000      
Accumulated Depreciation (11,501,000)      
EMEA | MU3 MUNICH, GERMANY [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 726,000      
Total Costs        
Land 0      
Buildings and Improvements 726,000      
Accumulated Depreciation (38,000)      
EMEA | PA1 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 21,527,000      
Total Costs        
Land 0      
Buildings and Improvements 21,527,000      
Accumulated Depreciation (17,093,000)      
EMEA | PA2 & PA3 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 29,615,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 23,723,000      
Buildings and Improvements 240,675,000      
Total Costs        
Land 23,723,000      
Buildings and Improvements 270,290,000      
Accumulated Depreciation (75,980,000)      
EMEA | PA4 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 1,701,000      
Buildings and Improvements 9,503,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 127,215,000      
Total Costs        
Land 1,701,000      
Buildings and Improvements 136,718,000      
Accumulated Depreciation (26,823,000)      
EMEA | PA5 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 16,554,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 843,000      
Total Costs        
Land 0      
Buildings and Improvements 17,397,000      
Accumulated Depreciation (1,575,000)      
EMEA | PA6 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 56,322,000      
Total Costs        
Land 0      
Buildings and Improvements 56,322,000      
Accumulated Depreciation (5,006,000)      
EMEA | PA7 PARIS (METRO), FRANCE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 12,300,000      
Total Costs        
Land 0      
Buildings and Improvements 12,300,000      
Accumulated Depreciation (1,951,000)      
EMEA | SK1 STOCKHOLD, (METRO), SWEDEN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 15,495,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 574,000      
Total Costs        
Land 0      
Buildings and Improvements 16,069,000      
Accumulated Depreciation (2,216,000)      
EMEA | SK2 STOCKHOLD, (METRO), SWEDEN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 80,148,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 251,000      
Total Costs        
Land 0      
Buildings and Improvements 80,399,000      
Accumulated Depreciation (4,678,000)      
EMEA | SK3 STOCKHOLD, (METRO), SWEDEN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 13,167,000      
Total Costs        
Land 0      
Buildings and Improvements 13,167,000      
Accumulated Depreciation (858,000)      
EMEA | SO1 SOFIA, BULGARIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 5,236,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 312,000      
Total Costs        
Land 0      
Buildings and Improvements 5,548,000      
Accumulated Depreciation (353,000)      
EMEA | WA1 WARSZAWA,POLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 5,950,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 592,000      
Total Costs        
Land 0      
Buildings and Improvements 6,542,000      
Accumulated Depreciation (920,000)      
EMEA | WA2 WARSZAWA,POLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 4,709,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 6,615,000      
Total Costs        
Land 0      
Buildings and Improvements 11,324,000      
Accumulated Depreciation (770,000)      
EMEA | ZH1 ZURICH (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,457,000      
Total Costs        
Land 0      
Buildings and Improvements 5,457,000      
Accumulated Depreciation (4,619,000)      
EMEA | ZH2 ZURICH (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,460,000      
Total Costs        
Land 0      
Buildings and Improvements 5,460,000      
Accumulated Depreciation (3,563,000)      
EMEA | ZH4 ZURICH (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 11,284,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 24,868,000      
Total Costs        
Land 0      
Buildings and Improvements 36,152,000      
Accumulated Depreciation (16,116,000)      
EMEA | ZH5 ZURICH (METRO), SWITZERLAND [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 37,232,000      
Total Costs        
Land 0      
Buildings and Improvements 37,232,000      
Accumulated Depreciation (10,456,000)      
EMEA | ZW1 ZWOLLE, THE NETHERLANDS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,331,000      
Total Costs        
Land 0      
Buildings and Improvements 7,331,000      
Accumulated Depreciation (4,097,000)      
Asia-Pacific | OTHERS [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 13,401,000      
Total Costs        
Land 0      
Buildings and Improvements 13,401,000      
Accumulated Depreciation (4,661,000)      
Asia-Pacific | HK1 HONG KONG, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 131,250,000      
Total Costs        
Land 0      
Buildings and Improvements 131,250,000      
Accumulated Depreciation (65,402,000)      
Asia-Pacific | HK2 HONG KONG, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 237,118,000      
Total Costs        
Land 0      
Buildings and Improvements 237,118,000      
Accumulated Depreciation (51,447,000)      
Asia-Pacific | HK3 HONG KONG, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 134,342,000      
Total Costs        
Land 0      
Buildings and Improvements 134,342,000      
Accumulated Depreciation (44,062,000)      
Asia-Pacific | HK4 HONG KONG, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,003,000      
Total Costs        
Land 0      
Buildings and Improvements 7,003,000      
Accumulated Depreciation (3,963,000)      
Asia-Pacific | ME1 MELBOURNE, AUSTRALIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 15,341,000      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 66,103,000      
Total Costs        
Land 15,341,000      
Buildings and Improvements 66,103,000      
Accumulated Depreciation (5,854,000)      
Asia-Pacific | OS1 OSAKA, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 14,876,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 37,851,000      
Total Costs        
Land 0      
Buildings and Improvements 52,727,000      
Accumulated Depreciation (8,036,000)      
Asia-Pacific | OS2 OSAKA, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 103,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 0      
Total Costs        
Land 0      
Buildings and Improvements 103,000      
Accumulated Depreciation (26,000)      
Asia-Pacific | SG1 SINGAPORE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 160,917,000      
Total Costs        
Land 0      
Buildings and Improvements 160,917,000      
Accumulated Depreciation (104,697,000)      
Asia-Pacific | SG2 SINGAPORE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 261,025,000      
Total Costs        
Land 0      
Buildings and Improvements 261,025,000      
Accumulated Depreciation (99,403,000)      
Asia-Pacific | SG3 SINGAPORE [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 34,844,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 96,449,000      
Total Costs        
Land 0      
Buildings and Improvements 131,293,000      
Accumulated Depreciation (10,360,000)      
Asia-Pacific | SH2 SHANGHAI, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 3,482,000      
Total Costs        
Land 0      
Buildings and Improvements 3,482,000      
Accumulated Depreciation (971,000)      
Asia-Pacific | SH3 SHANGHAI, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 7,066,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,024,000      
Total Costs        
Land 0      
Buildings and Improvements 14,090,000      
Accumulated Depreciation (3,512,000)      
Asia-Pacific | SH4 SHANGHAI, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 1,657,000      
Total Costs        
Land 0      
Buildings and Improvements 1,657,000      
Accumulated Depreciation (1,422,000)      
Asia-Pacific | SH5 SHANGHAI, CHINA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 11,284,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 19,003,000      
Total Costs        
Land 0      
Buildings and Improvements 30,287,000      
Accumulated Depreciation (6,010,000)      
Asia-Pacific | SY1 SYDNEY, AUSTRALIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 25,261,000      
Total Costs        
Land 0      
Buildings and Improvements 25,261,000      
Accumulated Depreciation (14,036,000)      
Asia-Pacific | SY2 SYDNEY, AUSTRALIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 3,080,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 32,510,000      
Total Costs        
Land 0      
Buildings and Improvements 35,590,000      
Accumulated Depreciation (18,795,000)      
Asia-Pacific | SY3 SYDNEY, AUSTRALIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 8,712,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 134,257,000      
Total Costs        
Land 0      
Buildings and Improvements 142,969,000      
Accumulated Depreciation (42,948,000)      
Asia-Pacific | SY4 SYDNEY, AUSTRALIA [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 84,679,000      
Total Costs        
Land 0      
Buildings and Improvements 84,679,000      
Accumulated Depreciation (2,300,000)      
Asia-Pacific | TY1 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 18,547,000      
Total Costs        
Land 0      
Buildings and Improvements 18,547,000      
Accumulated Depreciation (10,787,000)      
Asia-Pacific | TY2 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 75,386,000      
Total Costs        
Land 0      
Buildings and Improvements 75,386,000      
Accumulated Depreciation (57,738,000)      
Asia-Pacific | TY3 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 69,367,000      
Total Costs        
Land 0      
Buildings and Improvements 69,367,000      
Accumulated Depreciation (23,762,000)      
Asia-Pacific | TY4 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 49,287,000      
Total Costs        
Land 0      
Buildings and Improvements 49,287,000      
Accumulated Depreciation (10,658,000)      
Asia-Pacific | TY5 TOKYO, JAPAN        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 102,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 49,598,000      
Total Costs        
Land 0      
Buildings and Improvements 49,700,000      
Accumulated Depreciation (2,045,000)      
Asia-Pacific | TY6 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 37,941,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 12,412,000      
Total Costs        
Land 0      
Buildings and Improvements 50,353,000      
Accumulated Depreciation (8,663,000)      
Asia-Pacific | TY7 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 13,175,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 869,000      
Total Costs        
Land 0      
Buildings and Improvements 14,044,000      
Accumulated Depreciation (2,759,000)      
Asia-Pacific | TY8 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 53,848,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 5,044,000      
Total Costs        
Land 0      
Buildings and Improvements 58,892,000      
Accumulated Depreciation (7,016,000)      
Asia-Pacific | TY9 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 106,710,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 8,197,000      
Total Costs        
Land 0      
Buildings and Improvements 114,907,000      
Accumulated Depreciation (15,450,000)      
Asia-Pacific | TY10 TOKYO, JAPAN [Member]        
Initial Costs to Company        
Encumbrances 0      
Land 0      
Buildings and Improvements 69,881,000      
Costs Capitalized Subsequent to Acquisition or Lease        
Land 0      
Buildings and Improvements 7,115,000      
Total Costs        
Land 0      
Buildings and Improvements 76,996,000      
Accumulated Depreciation $ (5,707,000)