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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Goodwill And Intangible Assets [Line Items]      
Accumulated impairment losses associated with goodwill $ 0 $ 0  
Goodwill, impairments recorded $ 0 $ 0 $ 0
Minimum [Member]      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Cash flow discount rate 10.00%    
Maximum [Member]      
Schedule Of Goodwill And Intangible Assets [Line Items]      
Cash flow discount rate 11.00%