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Long Term Debt - Senior Notes - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jun. 14, 2012
USD ($)
Covenant
Oct. 05, 2010
USD ($)
Covenant
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2010
USD ($)
Debt Instrument [Line Items]              
Interest expense related to amortization of debt issuance costs     $ 2.8 $ 2.2 $ 2.2    
4.97% Series A Senior Notes, Due October 5th 2020              
Debt Instrument [Line Items]              
Debt maturity date   Oct. 05, 2020          
Long-term debt, aggregate principal amount   $ 300.0          
Debt interest rate   4.97%          
Semi-annual interest payment, first payment date     April 5        
Semi-annual interest payment, second payment date     October 5        
Notes issuance date   Oct. 05, 2010          
Description of the prepayment terms     Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.        
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium   100.00%          
Description of the acceptance terms     If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.        
Acceptance terms, percent of principal before accrued and unpaid interest   100.00%          
Number of compliance covenants | Covenant   2          
Note purchase agreement, financial covenant description     The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at December 31, 2015.        
Debt issuance costs             $ 10.8
4.97% Series A Senior Notes, Due October 5th 2020 | Minimum              
Debt Instrument [Line Items]              
Debt instrument, prepayment percentage of aggregate principal amount   5.00%          
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter   2.50%          
4.97% Series A Senior Notes, Due October 5th 2020 | Maximum              
Debt Instrument [Line Items]              
Debt to capitalization ratio, percentage the Company must not exceed at any time   50.00%          
4.27% Series B Senior Notes, Due June 14th 2022              
Debt Instrument [Line Items]              
Debt maturity date Jun. 14, 2022            
Long-term debt, aggregate principal amount $ 300.0            
Debt interest rate 4.27%            
Semi-annual interest payment, first payment date     April 5        
Semi-annual interest payment, second payment date     October 5        
Notes issuance date Jun. 14, 2012            
Description of the prepayment terms     Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.        
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium 100.00%            
Description of the acceptance terms     If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date.        
Acceptance terms, percent of principal before accrued and unpaid interest 100.00%            
Number of compliance covenants | Covenant 2            
Note purchase agreement, financial covenant description     The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at December 31, 2015.        
Debt issuance costs           $ 7.6  
4.27% Series B Senior Notes, Due June 14th 2022 | Minimum              
Debt Instrument [Line Items]              
Debt instrument, prepayment percentage of aggregate principal amount 5.00%            
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter 2.50%            
4.27% Series B Senior Notes, Due June 14th 2022 | Maximum              
Debt Instrument [Line Items]              
Debt to capitalization ratio, percentage the Company must not exceed at any time 50.00%            
Reimbursement Agreement And Two Thousand Fifteen Term Loan Agreement              
Debt Instrument [Line Items]              
Debt issuance costs     $ 2.0