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Long-Term Debt - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 28, 2016
USD ($)
Dec. 14, 2016
USD ($)
Debt Instrument [Line Items]          
Long-term debt $ 268,800,000 $ 131,600,000      
Finance cost capitalized 2,700,000 1,500,000 $ 2,600,000    
Amortization of deferred finance costs $ 400,000 $ 1,200,000 700,000    
Maximum ratio of net debt to EBITDA 3.0        
Minimum ratio of EBITDA to net interest 4.0        
Weighted average rate of interest on borrowings 1.72% 1.67%      
Payments of interest on long-term debt $ 2,600,000 $ 2,300,000 2,300,000    
Net cash outflows in respect of refinancing costs 1,200,000 1,500,000 $ 100,000    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term debt 161,000,000 133,000,000      
Finance cost capitalized $ 1,200,000 1,500,000      
Revolving Credit Facility [Member] | Third Amendment and Restatement Agreement [Member]          
Debt Instrument [Line Items]          
Revolving Credit Facility         $ 200,000,000
Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Termination date of the revolving facility Revolving facility remains November 6, 2020. The term loan has an $11,000,000 repayment installment due December 28, 2017, a $16,500,000 installment due December 28, 2018 and a $22,000,000 installment due December 28, 2019, with the outstanding balance due on November 6, 2020.        
Installment due December 28, 2017       $ 11,000,000  
Installment due December 28, 2018       16,500,000  
Installment due December 28, 2019       $ 22,000,000  
Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term debt $ 110,000,000 $ 0      
Term Loan [Member] | Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Long-term debt         $ 110,000,000