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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Goodwill And Other Intangible Assets [Line Items]              
Amortization expense of finite life intangible assets $ 3,500,000   $ 3,300,000 $ 11,123,000 $ 8,513,000    
Goodwill 224,531,000 $ 220,163,000   224,531,000   $ 220,163,000 $ 165,861,000
Intangible assets-indefinite life 26,393,000 26,337,000   26,393,000   26,337,000 $ 19,766,000
Impairment of intangible assets           3,340,000  
Goodwill or indefinite life intangible asset charges 0     0      
Reporting Unit One [Member]              
Schedule Of Goodwill And Other Intangible Assets [Line Items]              
Goodwill impairment charges           0  
Goodwill 77,900,000 77,900,000   77,900,000   $ 77,900,000  
Estimated fair value of goodwill exceeds from its carrying value           8.00%  
Decrease in projected revenue growth rate           1.10%  
Decrease in projected operational profit           3.90%  
Reporting Unit One [Member] | Tradename [Member]              
Schedule Of Goodwill And Other Intangible Assets [Line Items]              
Intangible assets-indefinite life $ 5,000,000     $ 5,000,000      
Three Reporting Units [Member]              
Schedule Of Goodwill And Other Intangible Assets [Line Items]              
Intangible assets-indefinite life   $ 10,000,000       $ 10,000,000  
Fair value lower than the aggregate carrying value   33.40%       33.40%  
Impairment of intangible assets   $ 3,300,000