Combined Consolidated Statements of Financial Condition (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 96,957 $ 81,208
Accounts receivable 21,359 18,409
Accounts receivable-Manning & Napier Fund, Inc. 13,209 12,850
Investment securities, at fair value 12,630 4,642
Prepaid expenses and other assets 5,423 4,126
Total current assets 149,578 121,235
Property and equipment, net 4,539 3,812
Net deferred tax assets, non-current 49,154 53,786
Total non-current assets 53,693 57,598
Total assets 203,271 178,833
Liabilities    
Accounts payable 1,912 1,139
Accrued expenses and other liabilities 32,012 30,099
Deferred revenue 11,136 9,902
Total current liabilities 45,060 41,140
Amounts payable under tax receivable agreement 43,989 45,885
Total non-current liabilities 43,989 45,885
Total liabilities 89,049 87,025
Commitments and contingencies (Note 7)      
Shareholders' equity    
Additional paid-in capital 194,354 188,133
Retained deficit (30,966) (27,167)
Accumulated other comprehensive income 1 2
Total shareholders' equity attributable to Manning & Napier Group 163,525 161,104
Noncontrolling deficit (49,303) (69,296)
Total shareholders' equity and noncontrolling deficit 114,222 91,808
Total liabilities, shareholders' equity and noncontrolling deficit 203,271 178,833
Class A common stock [Member]
    
Shareholders' equity    
Common stock 136 136
Total shareholders' equity and noncontrolling deficit 136 136
Class B common stock [Member]
    
Shareholders' equity    
Common stock 0 0
Total shareholders' equity and noncontrolling deficit $ 0 $ 0