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Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 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 |  | $ 10,000,000.0 | $ 350,000,000.0 |  |  | $ 600,000,000.0 | $ 400,000,000.0 |  | $ 800,000,000.0 |
Unsecured Long-term Debt, Noncurrent |  | 360,000,000.0 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 250,000,000.0 |  |  |  |  |  |  |  |  |
Debt Instrument, Annual Principal Payment |  | 1,494,998,000 | 1,506,990,000 |  |  |  |  |  |  |
Senior Notes |  | $ 848,583,000 | $ 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 |  | $ 350,000,000.0 | $ 500,000,000.0 |  |  |  |  |  |  |
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 |  | $ 499,140,000 | $ 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 |  | 1.50% | 1.50% |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent | 300,000,000.0 |  | $ 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 |  |  |  |  |  |

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