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Cash Dividend (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash dividend declaration date	Mar. 09, 2020	Mar. 06, 2019	Jun. 10, 2019	Sep. 16, 2019	Dec. 09, 2019	Dec. 10, 2018
Cash dividend record date	Mar. 26, 2020	Mar. 27, 2019	Jun. 28, 2019	Oct. 03, 2019	Dec. 26, 2019	Dec. 27, 2018
Cash dividend distributed date	Apr. 16, 2020	Apr. 10, 2019	Jul. 12, 2019	Oct. 17, 2019	Jan. 09, 2020	Jan. 10, 2019
Cash dividend per share	$ 0.020	$ 0.020	$ 0.020	$ 0.020	$ 0.020	$ 0.020
Cash dividend paid	$ 586	$ 580	$ 580	$ 582	$ 582	$ 581

X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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=121583591&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=121583591&loc=d3e4304-108586

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X

- 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=121583591&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

No definition available.

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- References

No definition available.

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