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Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Jan. 15, 2015
Apr. 16, 2014
Apr. 15, 2014
Jul. 01, 2013
Debt Instrument [Line Items]            
Total current portion of long-term debt $ 80,492,000 $ 73,125,000        
Total notes 598,667,000 598,628,000        
Long-term credit agreements 467,500,000 481,250,000   $ 25,000,000.0    
Debt Issuance Costs, Gross (7,840,000) (8,260,000)        
Total long-term debt 1,058,327,000 1,071,618,000        
Current portion of long-term debt 80,492,000 73,125,000        
Total debt 1,138,819,000 1,144,743,000        
Notes Payable, Current 492,000 0        
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016            
Debt Instrument [Line Items]            
Current portion of senior notes 25,000,000 25,000,000 $ 25,000,000      
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018            
Debt Instrument [Line Items]            
Total notes 100,000,000 100,000,000        
4.200% senior notes, semi-annual interest payments, balloon due 2024            
Debt Instrument [Line Items]            
Total notes 498,667,000 498,628,000        
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.75%, expires May 20, 2019            
Debt Instrument [Line Items]            
Current portion of loan facility 55,000,000 48,125,000        
Long-term credit agreements 467,500,000 $ 481,250,000        
Revolving Credit Loan Expires In Two Thousand Sixteen [Member]            
Debt Instrument [Line Items]            
Long-term credit agreements $ 0          
Beecher [Member] | Wells Fargo [Member]            
Debt Instrument [Line Items]            
Long-term credit agreements         $ 50,000,000.0 $ 50,000,000.0