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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Feb. 27, 2017
Jan. 01, 2017
Jun. 07, 2016
Apr. 30, 2015
Debt Instrument [Line Items]          
Company's outstanding obligations for capital leases $ 43,500,000   $ 48,700,000    
Debt issued by subsidiaries 0        
Guarantees of company debt $ 0        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Maturity date of debt instruments Oct. 16, 2019        
Aggregate maximum borrowing capacity         $ 450,000,000
Period of unsecured revolving credit agreement 5 years        
Letters of credit $ 50,000,000        
Annual facility fee, percentage 0.15%        
Senior Unsecured Notes Due in 2023 [Member] | PGIM, Inc and Certain of Its Affiliates [Member]          
Debt Instrument [Line Items]          
Senior notes, face amount   $ 125,000,000      
Debt instrument, interest rate   3.28%      
Debt instrument, frequency of periodic payment semi-annually        
Maturity date of debt instruments Feb. 27, 2023        
Aggregate maximum borrowing capacity   $ 175,000,000      
Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Term loan facility due in fiscal 2018 using Revolving Credit Facility $ 15,000,000        
Senior notes, face amount       $ 300,000,000  
Maturity date of debt instruments Jun. 07, 2021        
Aggregate maximum borrowing capacity       $ 500,000,000  
Period of unsecured term loan agreement 5 years