Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	6 Months Ended	11 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2017	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Cash equivalents	$ 0		$ 0
Federal depository insurance coverage	250,000		250,000
Minimum value of net tangible assets	5,000,001		5,000,001
Maximum underwriter discount	$ 24,750,000		$ 24,750,000
Dilutive securities	0	0	0
Accrued interest and penalties	$ 0	$ 0	$ 0
State franchise taxes	$ 0		$ 0
Public Offering
Significant Accounting Policies [Line Items]
Public offering, number of units sold	45,000,000		45,000,000
Deferred offering costs	$ 1,299,223		$ 1,299,223
Class A ordinary shares
Significant Accounting Policies [Line Items]
Public offering, number of units sold		0
Minimum value of net tangible assets	$ 5,000,001		$ 5,000,001
Ordinary shares subject to possible redemption	43,699,461	42,959,940	43,646,490
Class A ordinary shares \| Maximum
Significant Accounting Policies [Line Items]
The maximum possible number of Class A shares that can be issued under warrants	22,333,333	22,333,333	22,333,333
Class A ordinary shares \| Public Offering
Significant Accounting Policies [Line Items]
Public offering, number of units sold	45,000,000	45,000,000	45,000,000

Maximum underwriter discount.

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Significant accounting policies.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

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Number of new stock issued during the period.

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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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