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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Mar. 29, 2018	Mar. 04, 2018	Mar. 31, 2018	Mar. 31, 2017
Equity [Line Items]
Dividend declared date		Mar. 04, 2018
Dividend payable, per share		$ 0.25	$ 0.25	$ 0.00
Dividend payable date		Mar. 29, 2018
Dividend payable, date of record		Mar. 21, 2018
Dividends paid to shareholders	$ 3,500		$ 3,499
Accrued dividends			$ 50
Ordinary Shares B
Equity [Line Items]
Shares repurchased			0	0

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Equity.

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

+ References

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

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

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

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

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

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Number of shares that have been repurchased and retired during the period.

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