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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Liability for uncertain tax positions	$ 500		$ 500		$ 900
Deferred income taxes on undistributed earnings			(595)	$ (1,079)
Income tax expense (benefit)	$ 739	$ 1,337	$ (2,569)	$ 6,764
Effective income tax rate	27.70%	(11.50%)	(38.10%)	(524.70%)
Zhongli [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			$ (4,400)
Foreign Subsidiaries [Member]
Income Taxes [Line Items]
Deferred income taxes on undistributed earnings			$ 0		$ 600
Federal Authorities [Member]
Income Taxes [Line Items]
Open tax years			2014 2015 2016 2017 2018 2019
State and Foreign Authorities [Member]
Income Taxes [Line Items]
Open tax years			2014 2015 2016 2017 2018 2019

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