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Revenue Recognition and Accounts Receivable - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Other Long-Term Assets or Other Current Assets [Member]      
Revenue Recognition And Accounts Receivable [Line Items]      
Other contract assets   $ 3.5 $ 1.9
Puerto Rico [Member]      
Revenue Recognition And Accounts Receivable [Line Items]      
Proceeds from settlement of trade accounts receivable $ 1.4    
Accounts receivable 2.5    
Contractual allowances 0.4    
Recovery of the allowance for doubtful accounts $ 1.0