Summary of Total Impairment Losses Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Real estate and intangible asset impairment $ 24,610 $ 1,481 $ 26,247 $ 3,584
Write-off of lease intangibles due to lease terminations 2,529 487 2,599 487
Loans receivable recovery 0 (367) 0 (367)
Other impairment 488 0 488 0
Total impairment loss continuing and discontinued operations $ 27,627 $ 1,601 $ 29,334 $ 3,704