v3.5.0.2

CONDENSED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - shares	1 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2016
Common stock, redemption shares		35,545,719
Class F Common Stock
Common stock, shares forfeited	2,125,000

X

- Definition

Common stock shares forfeited.

+ References

No definition available.

+ Details

Name:	grshu_CommonStockSharesForfeited
Namespace Prefix:	grshu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=grshu_CommonClassFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: