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Long-Term Debt - Narrative (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2017 | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  | Jun. 30, 2019 |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 587,500,000 | $ 965,000,000 |  | $ 587,500,000 | $ 965,000,000 |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  | 350,000,000.0 |  |  | 350,000,000.0 |  | $ 10,000,000.0 |  | $ 600,000,000.0 | $ 400,000,000.0 |  | $ 800,000,000.0 |
Write off of Deferred Debt Issuance Cost |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |
Debt Instrument, Periodic Payment, Principal |  | 10,000,000.0 | 365,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 2,800,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans |  | 350,000,000.0 |  |  | 350,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes |  | 848,636,000 | 499,101,000 |  | 848,636,000 | 499,101,000 |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt balance |  | 1,481,777,000 | 1,506,990,000 |  | 1,481,777,000 | 1,506,990,000 |  |  |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  | 4.50% |  |  | 4.20% |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |
Outstanding debt balance |  | 500,000,000.0 |  |  | 500,000,000.0 |  |  | $ 350,000,000.0 |  |  |  |  |  |
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 |  |  |  | $ 350,000,000.0 |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | 67,500,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | 300,000,000.0 | $ 292,500,000 | $ 300,000,000.0 |  | $ 292,500,000 | $ 300,000,000.0 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  | $ 475,000,000.0 |  |
Master Agreement | Series E |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50%
LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  | 2.438% |  |  | 2.438% |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
Maximum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee |  |  |  |  | 0.25% | 0.25% |  |  |  |  |  |  |  |
Maximum | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  | 1.75% | 1.75% |  |  |  |  |  |  |  |
Maximum | LIBOR | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Minimum [Member] | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | LIBOR | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  | 1.50% | 1.50% |  |  |  |  |  |  |  |
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 The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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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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