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Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]
Date of incorporation	Jan. 29, 2007

X

- Definition

Date when an entity was incorporated

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

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