XML 63 R55.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes [Line Items]        
Income tax expense for income and the portion of earnings retained based on 162(m) limitations $ 10.1 $ 7.1 $ 19.5 $ 13.2
Income tax expense - effective tax rate, percentage     52.00%  
Federal, state, and city statutory corporate tax rate, percentage     45.00%  
Real Estate Investment Trust [Member]
       
Income Taxes [Line Items]        
Income tax expense for income and the portion of earnings retained based on 162(m) limitations $ 2.7 $ 1.7 $ 6.8 $ 3.0
Maximum percent amount of ordinary income that the combined statutory tax rate applies to, percentage     10.00%