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Variable Interest Entities - Non-Consolidated Variable Interest Entities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other Receivables $ 2,329 $ 2,005
Other Investments, at Fair Value 77 88
Maximum Exposure to loss in non- consolidated VIEs 2,406 2,093
Managed VIEs [Member]
    
Other Receivables 2,224 1,830
Maximum Exposure to loss in non- consolidated VIEs 2,224 1,830
Third party managed VIEs [Member]
    
Other Receivables 105 175
Other Investments, at Fair Value 77 88
Maximum Exposure to loss in non- consolidated VIEs $ 182 $ 263