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Discontinued operations - Disposal of Discontinued Activity Phantom (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	$ 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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No definition available.

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