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Business Combinations - Summary of Purchase Price Allocation as of Acquisition Date (Detail) - USD ($)
$ in Thousands
Apr. 21, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets acquired and liabilities assumed        
Goodwill   $ 90,338 $ 74,525 $ 60,212
EFG        
Assets acquired and liabilities assumed        
Cash $ 250      
Other assets 31      
Investment sales pipeline intangible asset 1,426      
Accounts payable (64)      
Noncontrolling interests (4,339)      
Goodwill 15,713      
Consideration paid 13,017      
Walker & Dunlop | EFG        
Goodwill recognized        
Goodwill, tax deductible portion $ 11,800      
Period for recognition of deductions 15 years