Comprehensive (Loss) Income Attributable to Noncontrolling Shareholders' Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Net income (loss) attributable to noncontrolling shareholders' interests	$ 519	$ (336)	$ 1,365	$ 301
Other comprehensive income (loss):
Currency translation adjustments	1,315	(1,988)	860	(1,348)
Comprehensive income (loss) attributable to noncontrolling shareholders’ interests	$ 1,834	$ (2,324)	$ 2,225	$ (1,047)