Organization and Business Operations - Additional Information (Details) - USD ($)			9 Months Ended
	Nov. 01, 2019	Sep. 11, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Share price		$ 10.00
Proceeds from sale of Units in initial public offering		$ 400,000,000		$ 400,000,000
Proceeds from sale of Private Placement Warrants to Sponsor				$ 10,000,000
Amount placed in trust account		400,000,000	$ 407,067,134		$ 402,605,952
Maximum maturity period			180 days
Regulatory withdrawal of interest from trust account, annual limit			$ 750,000
Regulatory withdrawal of interest from trust account, maximum period			24 months
Redemption percentage if business combination is not completed			100.00%
Number of days to seek shareholder approval for redemption of shares			2 days
Number of days to provide opportunity to shareholders to sell their shares			2 days
Dissolution expenses, maximum allowed			$ 100,000
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of months to complete business combination			24 months
Threshold net tangible assets			$ 5,000,001
Number of days to redeem the shares if Business combination is not completed			10 days
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of fair market value			80.00%
Private Placement
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from sale of Private Placement Warrants to Sponsor		$ 10,000,000
Subsequent Event
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Gross proceed from private placement	$ 220,000,000
Subsequent Event | Private Placement
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Sale of common stock	23,913,044
Share price	$ 9.20
Shares subject to cancellation in private placement	3,000,000
Discount price	$ 9.20
Subsequent Event | Proposed PAE Business Combination
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Closing amount expected to be paid in cash	$ 444,000,000
Value of newly issued shares	251,000,000
Consideration payable including assumed indebtedness	572,000,000
Aggregate purchase price expected to be paid	$ 1,400,000,000
Maximum additional earn-out payments to be paid	4,000,000
Period on which additional earn-out payments granted on exceeding certain thresholds	5 years
Subsequent Event | EAP Merger Sub, Inc | Proposed PAE Business Combination
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of outstanding common stock to be owned	100.00%
Subsequent Event | EAP Merger Sub II, LLC | Proposed PAE Business Combination
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of outstanding common stock to be owned	100.00%