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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]      
Goodwill $ 44,438 $ 44,438  
Amortization expense $ 3,241 $ 3,323 $ 2,831
Customer Relationships      
Goodwill [Line Items]      
Weighted average amortization period 8 years    
Minimum      
Goodwill [Line Items]      
Estimated useful life of intangible assets 7 years    
Maximum      
Goodwill [Line Items]      
Estimated useful life of intangible assets 10 years