Significant Accounting Policies - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Cash balance, federal depository insurance coverage	$ 250,000
Shares subject to possible redemption, issued	38,250,049	0
Accrued interest and penalties related to unrecognized tax liabilities	$ 0
Investments and cash held in Trust Account	$ 400,382,026
Redemption percentage for release of Trust Account funds	100.00%
Redemption percentage if business combination is not completed	100.00%
Maximum release period	24 months
Dissolution expenses, maximum allowed	$ 100,000
Redemption rights or liquidating distributions with respect to warrants	0
Current liabilities	464,512	$ 261,619
Working capital	1,118,473	1,316
Maximum
Significant Accounting Policies [Line Items]
Threshold net tangible assets	$ 5,000,001
Number of months to complete business combination	24 months
Maximum release period	24 months
Number of days to redeem the shares if Business combination is not completed	10 days
Minimum
Significant Accounting Policies [Line Items]
Number of days to redeem the shares if Business combination is not completed	10 days
Class A Common Stock
Significant Accounting Policies [Line Items]
Sale of common stock (in shares)	40,000,000
Shares subject to possible redemption, issued	38,250,049
IPO
Significant Accounting Policies [Line Items]
offering costs including underwriter’s fees	$ 22,731,922	153,198
Underwriter's fees	22,000,000	$ 22,000,000
IPO | Maximum
Significant Accounting Policies [Line Items]
Threshold net tangible assets	$ 5,000,001
IPO | Class A Common Stock
Significant Accounting Policies [Line Items]
Sale of common stock (in shares)	40,000,000