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Current and Deferred Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Current	$ 4,354	$ 3,624	$ 4,077
Deferred	465	(24,729)	(4,066)
Total	$ 4,819	$ (21,105)	$ 11

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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