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Trust Account and Fair Value Measurements (Details) - US Treasury Securities [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Carrying Value	$ 501,340,048	$ 500,080,274
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(23,491)
Held-to-maturity Securities, Gross unrealized Holding Gains		20,595
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	$ 501,316,557	$ 500,100,869

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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