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Intangible Assets and Goodwill (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Goodwill information for each reporting unit    
Balance at the beginning of the period   $ 115,148,000
Addition to goodwill   23,521,000 [1]
Goodwill impairment charge   (13,700,000) [2]
Balance at the end of the period   124,969,000
LDT
    
Goodwill information    
Impairment charge 15,400,000 15,400,000
Impairment charge for tangible and intangible assets 21,800,000  
Goodwill information for each reporting unit    
Goodwill impairment charge   (13,700,000)
LDT | Building Improvements
    
Goodwill information    
Tangible asset impairment charges 5,800,000  
LDT | Software
    
Goodwill information    
Tangible asset impairment charges 600,000  
MID
    
Goodwill information for each reporting unit    
Balance at the beginning of the period   4,454,000
Addition to goodwill   15,451,000 [1]
Goodwill impairment charge   0 [2]
Balance at the end of the period   19,905,000
CTO
    
Goodwill information for each reporting unit    
Balance at the beginning of the period   0
Addition to goodwill   8,070,000 [1]
Goodwill impairment charge   0 [2]
Balance at the end of the period   8,070,000
All Other
    
Goodwill information for each reporting unit    
Balance at the beginning of the period   110,694,000
Addition to goodwill   0 [1]
Goodwill impairment charge   (13,700,000) [2]
Balance at the end of the period   $ 96,994,000
Minimum
    
Goodwill information    
Discount rates for key assumptions used in applying income approach 20.00%  
Maximum
    
Goodwill information    
Discount rates for key assumptions used in applying income approach 35.00%  
[1] The addition to goodwill resulted from two business combinations in the first quarter of 2012. See Note 5, “Acquisitions” for further details.
[2] The Company recorded a non-cash goodwill impairment charge of $13.7 million related to the LDT reporting unit asdiscussed above.