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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
sqft
Jun. 30, 2012
sqft
Jun. 30, 2013
item
sqft
Jun. 30, 2012
sqft
Segment information        
Number of reportable segments     3  
Geographic segments, immediately preceding period     6 months  
Geographic segments, minimum percentage of total square feet, annualized revenues or property net operating income, or net operating income defined as rental income less operating expenses     5.00%  
Property square feet 72,717,000 67,870,000 72,717,000 67,870,000
Property rental income $ 274,766 $ 249,797 $ 549,814 $ 493,175
Property NOI 165,012 146,763 330,401 292,905
Office
        
Segment information        
Number of properties reclassified to discontinued operations     40  
CBD Office
        
Segment information        
Properties owned 54   54  
Number of real estate properties reclassified from one geographical segment to another geographical segment     3  
Property square feet 22,051,000 20,494,000 22,051,000 20,494,000
Property rental income 139,805 133,251 282,556 261,390
Property NOI 75,126 72,367 153,819 144,342
Suburban Office
        
Segment information        
Properties owned 246   246  
Number of properties reclassified to discontinued operations     3  
Property square feet 20,348,000 18,663,000 20,348,000 18,663,000
Property rental income 89,777 77,141 176,910 152,284
Property NOI 54,711 45,160 106,615 89,299
Industrial and Other
        
Segment information        
Properties owned 145   145  
Property square feet 30,318,000 28,713,000 30,318,000 28,713,000
Property rental income 45,184 39,405 90,348 79,501
Property NOI 35,175 29,236 69,967 59,264
Industrial
        
Segment information        
Number of properties reclassified to discontinued operations     57  
Metro Chicago, IL
        
Segment information        
Property square feet 4,871,000 4,860,000 4,871,000 4,860,000
Property rental income 32,058 33,331 63,909 63,880
Property NOI 16,668 17,672 32,709 33,117
Metro Chicago, IL | CBD Office
        
Segment information        
Property square feet 3,601,000 3,592,000 3,601,000 3,592,000
Property rental income 25,747 26,472 50,896 51,047
Property NOI 13,411 13,909 25,680 26,287
Metro Chicago, IL | Suburban Office
        
Segment information        
Property square feet 1,166,000 1,164,000 1,166,000 1,164,000
Property rental income 6,200 6,748 12,791 12,611
Property NOI 3,155 3,660 6,825 6,623
Metro Chicago, IL | Industrial and Other
        
Segment information        
Property square feet 104,000 104,000 104,000 104,000
Property rental income 111 111 222 222
Property NOI 102 103 204 207
Oahu, HI
        
Segment information        
Property square feet 17,914,000 17,876,000 17,914,000 17,876,000
Property rental income 20,976 18,298 42,187 38,193
Property NOI 16,624 14,171 33,361 29,685
Oahu, HI | Industrial and Other
        
Segment information        
Property square feet 17,914,000 17,876,000 17,914,000 17,876,000
Property rental income 20,976 18,298 42,187 38,193
Property NOI 16,624 14,171 33,361 29,685
Metro Philadelphia, PA
        
Segment information        
Property square feet 4,852,000 4,851,000 4,852,000 4,851,000
Property rental income 26,396 30,227 56,402 60,371
Property NOI 13,154 16,420 29,155 32,207
Metro Philadelphia, PA | CBD Office
        
Segment information        
Property square feet 4,597,000 4,596,000 4,597,000 4,596,000
Property rental income 25,503 29,287 54,634 58,587
Property NOI 12,905 16,193 28,701 31,777
Metro Philadelphia, PA | Suburban Office
        
Segment information        
Property square feet 255,000 255,000 255,000 255,000
Property rental income 893 940 1,768 1,784
Property NOI 249 227 454 430
Other Markets
        
Segment information        
Property square feet 45,080,000 40,283,000 45,080,000 40,283,000
Property rental income 195,336 167,941 387,316 330,731
Property NOI 118,566 98,500 235,176 197,896
Other Markets | CBD Office
        
Segment information        
Property square feet 13,853,000 12,306,000 13,853,000 12,306,000
Property rental income 88,555 77,492 177,026 151,756
Property NOI 48,810 42,265 99,438 86,278
Other Markets | Suburban Office
        
Segment information        
Property square feet 18,927,000 17,244,000 18,927,000 17,244,000
Property rental income 82,684 69,453 162,351 137,889
Property NOI 51,307 41,273 99,336 82,246
Other Markets | Industrial and Other
        
Segment information        
Property square feet 12,300,000 10,733,000 12,300,000 10,733,000
Property rental income 24,097 20,996 47,939 41,086
Property NOI $ 18,449 $ 14,962 $ 36,402 $ 29,372