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Debt - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long-term debt, due in 2016 $ 11,000,000    
Long-term debt, due in 2017 220,600,000    
Long-term debt, due in 2018 10,300,000    
Long-term debt, due in 2019 1,300,000    
Long-term debt, due in 2020 1,300,000    
Long-term debt, thereafter 2,000,000    
Capital leases, due in 2016 2,600,000    
Capital leases, due in 2017 2,800,000    
Capital leases, due in 2018 2,500,000    
Capital leases, due in 2019 1,300,000    
Capital leases, due in 2020 1,300,000    
Capital leases, thereafter 2,000,000    
Cash paid for interest 14,400,000 $ 13,200,000 $ 12,900,000
Capitalized interest expense 3,100,000 $ 4,000,000 $ 3,200,000
Maximum borrowing capacity under the credit agreement 150,000,000    
Letters of credit outstanding 11,400,000    
Availability under the facility 54,700,000    
Aggregate other debt default amount to violate covenant, minimum $ 50,000,000    
Covenant conditions of the credit facility The company is required to maintain a minimum fixed charge coverage ratio if the availability under the credit facility falls below the greater of 12.5% of the lenders’ commitments under the facility and $18.75 million. The credit agreement allows the company to pay dividends on its capital stock in an amount up to $22.5 million per year unless the company is in default and to, among other things, repurchase its equity, prepay other debt, incur other debt or liens, dispose of assets and make acquisitions, loans and investments, provided the company complies with certain requirements and limitations set forth in the agreement.    
Credit Facility, interest rate 2.20%    
Maximum      
Debt Instrument [Line Items]      
Availability under the facility $ 18,750,000    
Percentage of lenders' commitments under facility 12.50%    
Dividends on capital stock $ 22,500,000    
Letter of Credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity under the credit agreement 100,000,000    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowings outstanding $ 65,000,000