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Debt - Schedule of Debt Obligations (Parenthetical) (Detail)
$ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Term Debt [Member]        
Debt Instrument [Line Items]        
Interest rate on debt 5.50% 5.50% 5.80% 5.80%
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Available capacity $ 300.0      
Revolving Credit Facility [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Available capacity 2.7   $ 2.7  
Canada Line of Credit [Member]        
Debt Instrument [Line Items]        
Available capacity $ 5.2 $ 7.0 $ 5.1 $ 7.0