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Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) - USD ($)
6 Months Ended 12 Months Ended
Dec. 21, 2018
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Mar. 31, 2019
Mar. 11, 2019
Nov. 15, 2018
Jun. 28, 2017
Sep. 18, 2014
Apr. 17, 2014
Sep. 15, 2011
Debt Instrument [Line Items]                      
Unsecured Revolving Credit Facility     $ 350,000,000.0   $ 10,000,000.0   $ 600,000,000.0 $ 400,000,000.0   $ 800,000,000.0  
Unsecured Long-term Debt, Noncurrent   $ 350,000,000.0                  
Debt Instrument, Periodic Payment $ 250,000,000.0                    
Debt Instrument, Annual Principal Payment   1,481,777,000 1,506,990,000                
Senior Notes   $ 848,636,000 $ 499,101,000                
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018                      
Debt Instrument [Line Items]                      
Debt instrument maturity year   2029 2029                
Unsecured Senior Notes [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate, stated percentage           4.50%     4.20%    
Debt Instrument, Annual Principal Payment   $ 500,000,000.0     $ 350,000,000.0            
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024                      
Debt Instrument [Line Items]                      
Debt instrument maturity year   2024 2024                
Senior Notes   $ 499,180,000 $ 499,101,000                
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022                      
Debt Instrument [Line Items]                      
Line of credit facility, expiration period   5 years 5 years                
Line of credit facility, expiration date   Jun. 28, 2022 Jun. 28, 2022                
Five Year Term Loan Facility Expires In Two Thousand Ninteen Current [Member]                      
Debt Instrument [Line Items]                      
Debt instrument maturity year   2022 2022                
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022                      
Debt Instrument [Line Items]                      
Line of credit facility, expiration period   5 years 5 years                
Line of credit facility, expiration date   Jun. 28, 2022 Jun. 28, 2022                
Four Point Five Zero Zero Percent Senior Notes Due Two Thousand Twenty Nine [Member]                      
Debt Instrument [Line Items]                      
Senior Notes   $ 350,000,000.0       $ 350,000,000.0          
Maximum                      
Debt Instrument [Line Items]                      
Debt instrument, variable interest rate   1.75%                  
Maximum | Term Loan [Member] | LIBOR                      
Debt Instrument [Line Items]                      
Debt instrument, variable interest rate   1.75% 1.75%                
Minimum [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, variable interest rate   1.00%                  
Revolving Credit Facility [Member] | Maximum                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Commitment Fee Percentage   0.25% 0.25%                
Revolving Credit Facility [Member] | Maximum | LIBOR                      
Debt Instrument [Line Items]                      
Debt instrument, variable interest rate   1.75% 1.75%                
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR                      
Debt Instrument [Line Items]                      
Debt instrument, variable interest rate   1.50% 1.50%                
Term Loan [Member]                      
Debt Instrument [Line Items]                      
Unsecured Long-term Debt, Noncurrent 300,000,000.0 $ 292,500,000 $ 300,000,000.0                
Term Loan [Member] | Maximum                      
Debt Instrument [Line Items]                      
Unsecured Long-term Debt, Noncurrent 450,000,000.0                    
Term Loan [Member] | Minimum [Member]                      
Debt Instrument [Line Items]                      
Unsecured Long-term Debt, Noncurrent $ 300,000,000.0                    
Series E [Member] | Master Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate, stated percentage                     4.50%
Subsequent Event [Member]                      
Debt Instrument [Line Items]                      
Long-term Debt, Maturities, Repayments of Principal in Year Two       $ 3,800,000