Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Stockholder $ / shares shares	Jun. 30, 2019 $ / shares shares	Jun. 30, 2020 USD ($) Stockholder $ / shares shares	Jun. 30, 2019 $ / shares shares	Dec. 31, 2019 USD ($)
Equity [Line Items]
Dividend payable, per share | $ / shares	$ 0.25	$ 0.25	$ 0.25	$ 0.25
Accrued dividends | $	$ 0.5		$ 0.5		$ 0.3
Ordinary Shares A
Equity [Line Items]
Shares repurchased | shares	0	0	4,724	27,028
Number of shareholders | Stockholder	205		205
Ordinary Shares B
Equity [Line Items]
Shares repurchased | shares	0	0	0	0
Number of shareholders | Stockholder	4		4