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Discontinued operations - Disposal of Discontinued Activity (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Loss From Discontinued Operations Net Of Tax [Abstract]
Loss from operations of discontinued operations, income taxes	$ 0	$ 0	$ 0	$ 0
Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of tax expense (benefit) attributable to income (loss) from operations classified as a discontinued operation. Excludes tax expense (benefit) for gain (loss) on disposal and for provision for gain (loss) until disposal.

+ References

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- Definition

Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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