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Investments - Schedule of Real Estate Investment (Parenthetical) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Real Estate Investments [Abstract]
Amount tranferred from properties under development to investment real estate	$ 7.4

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- References

No definition available.

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- Definition

Amount transferred from properties under development to investment real estate.

+ References

No definition available.

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