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Indebtedness - Bank Debt - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) CommercialBank | Sep. 30, 2018 | Sep. 30, 2019 USD ($) CommercialBank | Sep. 30, 2018 | Oct. 31, 2019 USD ($) CommercialBank | Mar. 31, 2019 | Mar. 27, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Bank debt | $ 318,919,000 |  | $ 318,919,000 |  |  |  |  | $ 932,018,000
Bank Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Bank Credit facility, maximum amount | 4,000,000,000.0 |  | 4,000,000,000.0 |  |  |  |  |
Bank Credit facility, borrowing base | $ 3,000,000,000.0 |  | $ 3,000,000,000.0 |  |  |  | $ 3,000,000,000.0 |
Percentage holding of commercial banks, Maximum | 5.80% |  | 5.80% |  |  |  |  |
Number of commercial banks included in current bank group | CommercialBank | 27 |  | 27 |  |  |  |  |
Maturity date of loan |  |  | Apr. 13, 2023 |  |  |  |  |
Bank commitments | $ 2,000,000,000.0 |  | $ 2,000,000,000.0 |  |  |  | $ 2,000,000,000.0 |
Bank debt | 328,000,000.0 |  | 328,000,000.0 |  |  |  |  |
Undrawn letters of credit | 255,200,000 |  | 255,200,000 |  |  |  |  |
Borrowing capacity available under the commitment amount | $ 1,400,000,000 |  | $ 1,400,000,000 |  |  |  |  |
Weighted average interest rate on the bank credit facility | 3.80% | 3.90% | 4.00% | 3.70% |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  | 0.30% |  |  |  |  |
Bank Credit Facility | Scenario Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of commercial banks included in current bank group | CommercialBank |  |  |  |  | 27 |  |  |
Bank commitments |  |  |  |  | $ 2,400,000,000 |  |  |
Bank Credit Facility | Alternate Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin |  |  | 0.25% |  |  |  |  |
Bank Credit Facility | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin |  |  | 1.25% |  |  |  |  |
Bank Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  | 0.30% |  |  |  |  |
Bank Credit Facility | Minimum | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  | 0.15% |  |  |  |  |
Bank Credit Facility | Minimum | Alternate Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt | 0.25% |  | 0.25% |  |  |  |  |
Bank Credit Facility | Minimum | Alternate Base Rate | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt |  |  |  |  |  | 0.125% |  |
Bank Credit Facility | Minimum | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt | 1.25% |  | 1.25% |  |  |  |  |
Bank Credit Facility | Minimum | LIBOR Rate | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt |  |  |  |  |  | 1.125% |  |
Bank Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  | 0.375% |  |  |  |  |
Bank Credit Facility | Maximum | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  | 0.30% |  |  |  |  |
Bank Credit Facility | Maximum | Alternate Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt | 1.25% |  | 1.25% |  |  |  |  |
Bank Credit Facility | Maximum | Alternate Base Rate | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt |  |  |  |  |  | 0.75% |  |
Bank Credit Facility | Maximum | LIBOR Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt | 2.25% |  | 2.25% |  |  |  |  |
Bank Credit Facility | Maximum | LIBOR Rate | Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Base rate on debt |  |  |  |  |  | 1.75% |  |

X
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 noncurrent portion 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 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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