Quarterly report pursuant to sections 13 or 15(d)

Acquisitions - Securities America Acquisition - Additional Information (Detail)

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Acquisitions - Securities America Acquisition - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended
Nov. 04, 2011
Mar. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Business Acquisition [Line Items]        
Acquisition of outstanding capital stock of Securities America $ 150,000      
Earn out period 2 years      
Business acquisition contingent consideration factor to determine earn out payment 70,000      
Business acquisition date fair value of consideration transferred 157,111      
Liability recognized for an estimate of the business acquisition earn out 7,111     7,111
Legal and other acquisition related costs 2,971      
Decrease in estimated fair value of earn out     7,111  
Deferred tax liability related to acquisition   $ (935)