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Debt - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2021 USD ($)
Senior Notes due 2022 |
Debt Instrument [Line Items] |
Senior notes principal amount | $ 600,000,000
Senior notes interest rate | 3.95%
Frequency of senior notes payment | semi-annually in arrears on March 15 and September 15
Senior notes effective interest rate | 3.97%
Credit Agreement | Revolving Credit Facility |
Debt Instrument [Line Items] |
Maximum loan borrowing capacity | $ 300,000,000
Increase in commitment available | 300,000,000
Debt outstanding | 0
Credit Agreement | Revolving Credit Facility | Sublimit for Issuance of Letters of Credit |
Debt Instrument [Line Items] |
Maximum loan borrowing capacity | 100,000,000
Letters of credit outstanding | 11,900,000
Repurchase Agreement | Revolving Credit Facility |
Debt Instrument [Line Items] |
Maximum loan borrowing capacity | 150,000,000
Borrowing base limitations | 0
Debt outstanding | 0
3.00% Senior Notes due 2030 |
Debt Instrument [Line Items] |
Senior notes principal amount | $ 900,000,000
Senior notes interest rate | 3.00%
Frequency of senior notes payment | semi-annually in arrears on May 15 and November 15
$600M Senior Notes Due Two Thousand Thirty |
Debt Instrument [Line Items] |
Senior notes principal amount | $ 600,000,000
Senior notes effective interest rate | 3.02%
Additional Senior Notes Due Two Thousand Thirty |
Debt Instrument [Line Items] |
Senior notes principal amount | $ 300,000,000
Senior notes effective interest rate | 2.00%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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=120391452&loc=d3e13212-122682 + Details
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