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=27012166&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=98513485&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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash Dividends (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Dividends Payable [Line Items]
Cash dividends paid, per share	$ 0.04			$ 0.04			$ 0.12	$ 0.10
Cash dividends paid	$ 7,847	$ 8,344	$ 8,499	$ 8,685	$ 8,832	$ 4,443	$ 24,690	$ 21,960
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 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