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Summary of Significant Accounting Policies - Reclassification (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Summary of Significant Accounting Policies
Amount reclassified from financing activities to operating activities	$ 0.2

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration