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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2019 | Aug. 02, 2016 | Oct. 31, 2014 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Supplementary leverage ratio |  |  | 450.00% |  |  |  |
Interest coverage ratio |  |  | 250.00% |  |  |  |
Borrowings outstanding under Credit Facility |  |  |  | $ 485,000,000 | $ 560,000,000 |  | $ 485,000,000.0
Credit Facility, borrowings available |  |  |  |  |  |  | $ 260,000,000.0
Letter of Credit Facility |  |  |  | 40,000,000.0 |  |  |
Outstanding letters of credit , amount |  |  |  | 5,000,000.0 |  | $ 5,000,000.0 |
Debt instrument, principal amount |  |  |  | $ 1,500,000,000 | 1,575,000,000 |  |
Maturity Period 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  |  | 0.15% |  |  |  |
Maturity Period 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  |  | 0.20% |  |  |  |
Maximum [Member] | Maturity Period 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  |  | 0.30% |  |  |  |
Maximum [Member] | Maturity Period 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  |  | 0.40% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Maturity Period 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  |  | 1.25% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Maturity Period 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  |  | 2.00% |  |  |  |
NYFRB [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consolidated Funded Indebtedness Ratio | 1.50% |  |  |  |  |  |
NYFRB [Member] | Minimum [Member] | Maturity Period 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  |  | 1.50% |  |  |  |
NYFRB [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consolidated Funded Indebtedness Ratio | 2.50% |  |  |  |  |  |
NYFRB [Member] | Maximum [Member] | Maturity Period 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  |  | 2.50% |  |  |  |
Term Loan Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate description |  |  |  | Borrowings under the Term Loan Agreement bear interest, at our option, at a variable rate equal to either (i) the Alternate Base Rate (as defined in the Term Loan Agreement and consistent with the Revolving Credit Facility), plus an agreed spread (ranging from 50 to 150 basis points), or (ii) the Adjusted LIBO Rate (as defined in the Term Loan Agreement) plus an agreed spread (ranging from 150 to 250 basis points), which is established quarterly based on the Company's then Leverage Ratio (as defined in the Term Loan Agreement and consistent with the Revolving Credit Facility). The Company must also maintain a Leverage Ratio and Interest Coverage Ratio consistent with the Revolving Credit Facility. |  |  |
Term loan facility, unused borrowing capacity, Amount |  |  |  | $ 665,000.0 |  |  |
Term loan Maturity Date |  |  |  | Aug. 02, 2022 |  |  |
Term Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin | 0.50% |  |  |  |  |  |
Term Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin | 1.50% |  |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, principal amount |  | $ 350,000,000.0 |  | $ 350,000,000 | $ 350,000,000 |  |
Debt instrument, interest rate |  | 4.50% |  | 4.50% |  |  |
Debt instrument, maturity period |  | 2026-08 |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] | On or After August 1, 2019 and Prior to August 1, 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  | 100.00% |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 750,000,000.0 |  |  |
Credit Facility, available at the end |  |  |  | $ 665,000,000.0 |  |  |
Credit Facility, termination date |  |  |  | Aug. 02, 2022 |  |  |
Revolving Credit Facility [Member] | Swingline Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 25,000,000.0 |  |  |
Line of Credit | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  |  | 0.50% |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  |  |  | 0.125% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -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(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: 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 + 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=119400593&loc=d3e572229-122910 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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