Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 4 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended
Oct. 31, 2011
subsidiary
Jun. 30, 2014
Dec. 31, 2013
Aug. 08, 2014
Compensatory damages
Securities America
Subsequent Event
plaintiffs
claim
Apr. 30, 2013
Compensatory damages
Securities America
One former client
Jan. 31, 2014
Compensatory damages
Securities America
One former client
Nov. 30, 2013
Compensatory damages
Triad
plaintiffs
Loss Contingencies [Line Items]              
Number of subsidiaries included in law suit 2            
Damages sought by plaintiff       $ 4,500 $ 2,164 $ 3,000 $ 4,310
Number of plaintiffs       20     6
Life insurance policy, suitability amount           15,000  
Number of claims       4      
Accrued liabilities   $ 1,416 $ 3,291