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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2015
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Revolving credit facility, extended expiration date   2021-06      
Prepaid debt issuance cost, write off     $ 1,300,000    
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital   $ 25,700,000     $ 25,700,000
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding   0     0
Issuance of long-term debt   110,000,000   $ 510,000,000  
Repayment of long-term debt   $ 50,000,000   60,900,000  
LIBOR [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR   0.90%      
LIBOR [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR   1.50%      
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Term loan, outstanding borrowings   $ 600,000,000     540,000,000
Current portion of long-term debt   0     0
Restatement Adjustment          
Debt Instrument [Line Items]          
Issuance of long-term debt       60,000,000  
Repayment of long-term debt       $ 60,000,000  
Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price $ 900,000,000        
Senior notes, outstanding amount   $ 891,500,000     $ 891,100,000
Senior Unsecured Notes [Member] | Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price $ 400,000,000        
Senior unsecured notes, maturity period 5 years        
Senior unsecured notes, maturity year 2020        
Senior unsecured notes, coupon rate 3.00%        
Senior Unsecured Notes [Member] | Notes Due 2025 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price $ 500,000,000        
Senior unsecured notes, maturity period 10 years        
Senior unsecured notes, maturity year 2025        
Senior unsecured notes, coupon rate 4.00%        
Amended and Restated Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,250,000,000