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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 |  |  |  |  |  |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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