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Trust Account and Fair Value Measurements (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Sold Security, at Carrying Value	$ 862	$ 9,408
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Sold Security, at Carrying Value	$ 501,340,048	$ 500,080,274

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For any sales of securities categorized as held-to-maturity, this item represents the net carrying amount of the sold security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563

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