Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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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=121583591&loc=d3e4304-108586

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Cash dividends paid, per share													$ 0.10	$ 0.16	$ 0.14
Cash dividends paid													$ 18,862	$ 32,428	$ 30,589
Installment 1, FY 2020
Dividends Payable [Line Items]
Cash dividends paid, date				Mar. 19, 2020
Cash dividends paid, per share				$ 0.04
Cash dividends paid				$ 7,629
Installment 2, FY 2020
Dividends Payable [Line Items]
Cash dividends paid, date			Jun. 18, 2020
Cash dividends paid, per share			$ 0.02
Cash dividends paid			$ 3,735
Installment 3, FY 2020
Dividends Payable [Line Items]
Cash dividends paid, date		Sep. 17, 2020
Cash dividends paid, per share		$ 0.02
Cash dividends paid		$ 3,746
Installment 4, FY 2020
Dividends Payable [Line Items]
Cash dividends paid, date	Dec. 17, 2020
Cash dividends paid, per share	$ 0.02
Cash dividends paid	$ 3,752
Installment 1, FY 2019
Dividends Payable [Line Items]
Cash dividends paid, date								Mar. 21, 2019
Cash dividends paid, per share								$ 0.04
Cash dividends paid								$ 8,499
Installment 2, FY 2019
Dividends Payable [Line Items]
Cash dividends paid, date							Jun. 20, 2019
Cash dividends paid, per share							$ 0.04
Cash dividends paid							$ 8,344
Installment 3, FY 2019
Dividends Payable [Line Items]
Cash dividends paid, date						Sep. 19, 2019
Cash dividends paid, per share						$ 0.04
Cash dividends paid						$ 7,847
Installment 4, FY 2019
Dividends Payable [Line Items]
Cash dividends paid, date					Dec. 19, 2019
Cash dividends paid, per share					$ 0.04
Cash dividends paid					$ 7,738
Installment 1, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date												Mar. 22, 2018
Cash dividends paid, per share												$ 0.02
Cash dividends paid												$ 4,443
Installment 2, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date											Jun. 21, 2018
Cash dividends paid, per share											$ 0.04
Cash dividends paid											$ 8,832
Installment 3, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date										Sep. 20, 2018
Cash dividends paid, per share										$ 0.04
Cash dividends paid										$ 8,685
Installment 4, FY 2018
Dividends Payable [Line Items]
Cash dividends paid, date									Dec. 20, 2018
Cash dividends paid, per share									$ 0.04
Cash dividends paid									$ 8,629