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Subsequent Event - Additional Information (Detail) - $ / shares	Jul. 09, 2020	Apr. 29, 2020	Oct. 29, 2019	Jul. 10, 2019	Jul. 10, 2018
Subsequent Event [Line Items]
Annual common stock dividend declared		$ 1.00	$ 2.00	$ 3.00	$ 2.55
Dividend payable date, declared day		Apr. 29, 2020	Oct. 29, 2019	Jul. 10, 2019	Jul. 10, 2018
Dividend payable date		Jun. 17, 2020	Dec. 10, 2019	Aug. 20, 2019	Aug. 17, 2018
Stockholders of record date		May 27, 2020	Nov. 26, 2019	Aug. 06, 2019	Aug. 03, 2018
Subsequent Event [Member]
Subsequent Event [Line Items]
Special cash dividend	$ 1.85
Annual common stock dividend declared	$ 0.65
Dividend payable date, declared day	Jul. 09, 2020
Dividend payable date	Aug. 21, 2020
Stockholders of record date	Aug. 07, 2020

X

- Definition

The per share amount of a special dividend declared, as of the financial reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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