Annual report pursuant to section 13 and 15(d)

Acquisitions - Summary of Final Amounts Allocated to Acquired Assets and Assumed Liabilities (Detail)

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Acquisitions - Summary of Final Amounts Allocated to Acquired Assets and Assumed Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Goodwill $ 20,031 $ 15,891 $ 14,683
MW Commodity Advisors, LLC
     
Business Acquisition [Line Items]      
Receivables 7    
Liabilities (7)    
Total fair value of net tangible assets acquired       
Goodwill 147    
Total purchase consideration 147    
Ten-Sixty
     
Business Acquisition [Line Items]      
Goodwill 2,345    
Total purchase consideration 4,092    
Ten-Sixty | Customer Relationships
     
Business Acquisition [Line Items]      
Intangible asset 1,650    
Ten-Sixty | Non-compete Agreements
     
Business Acquisition [Line Items]      
Intangible asset $ 97