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Business Combinations - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2012
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Other income   $ 5.6 $ 5.9 $ 6.0
Maui, Inc.        
Business Acquisition [Line Items]        
Business acquisition, total initial consideration $ 37.6      
Business acquisition, cash paid 36.2      
Business acquisition, liabilities assumed 1.4      
Business acquisition maximum additional earn-out payment $ 18.0      
Additional earn-out payment period 3 years      
Fair value of the expected earn-out included in goodwill $ 16.0