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Assets and Liabilities Held for Sale - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]
Impairment loss recognized on assets held for sale	$ 2,190,000
Impairment loss on goodwill	6,151,000	$ 0	$ 0
Impairment loss recognized on other intangible assets	3,135,000
Losses before income taxes on disposal	$ 15,747,000	$ 1,949,000

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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