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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Other Intangible Assets [Line Items]          
Amortization of intangibles       $ 4,257,565 $ 3,535,061
Expected amortization expense 2016, related to intangible assets $ 3,700,000     3,700,000  
Expected amortization expense 2017, related to intangible assets 3,600,000     3,600,000  
Expected amortization expense 2018, related to intangible assets 2,500,000     2,500,000  
Expected amortization expense 2019, related to intangible assets 1,100,000     1,100,000  
Expected amortization expense 2020, related to intangible assets 600,000     600,000  
Expected amortization expense thereafter, related to intangible assets 300,000     300,000  
Indefinite-lived intangible assets other than goodwill       $ 0  
Impairment of goodwill   $ 0 $ 0    
Earth911 E-commerce Marketplace Website [Member]          
Goodwill And Other Intangible Assets [Line Items]          
Amortization of intangibles $ 566,000