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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Commitments And Contingencies Disclosure [Line Items]          
Capital lease assets $ 64.7   $ 64.7   $ 64.9
Assets fully depreciated     23.1   19.1
Capital leased assets, net book value 17.8   17.8   22.1
Accumulated depreciation 46.9   46.9   $ 42.8
Actual purchases made under contract $ 6.5 $ 16.6 $ 32.9 $ 41.5  
Contract One [Member]          
Commitments And Contingencies Disclosure [Line Items]          
Extended term of contract     Dec. 31, 2016    
Contract Two [Member]          
Commitments And Contingencies Disclosure [Line Items]          
Number of product supply contracts | Contract     2    
Extended term of contract     Aug. 31, 2017    
Minimum [Member]          
Commitments And Contingencies Disclosure [Line Items]          
Estimated life of capital lease     4 years    
Noncancellable operating leases, renewal period     1 year    
Maximum [Member]          
Commitments And Contingencies Disclosure [Line Items]          
Estimated life of capital lease     6 years    
Noncancellable operating leases, renewal period     5 years