Sale of Stock [Axis] Initial Public Offering ("Public Offering") [Member] Legal Entity [Axis] Cantor Fitzgerald & Co. (the "Underwriter") [Member] Class of Stock [Axis] Warrant [Member] Over-Allotment Option [Member] Private Placement [Member] Class A Common Stock [Member] Class F Common Stock [Member] Related Party [Axis] MP Acquisition Sponsor LLC (the "Sponsor") [Member] Measurement Frequency [Axis] Recurring [Member] Fair Value, Hierarchy [Axis] Quoted Prices in Active Markets (Level 1) [Member] Significant Other Observable Inputs (Level 2) [Member] Significant Other Unobservable Inputs (Level 3) [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Antidilutive Securities [Axis] Equity Components [Axis] Additional Paid-in Capital [Member] Accumulated Deficit [Member] Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Trading Symbol Document Period End Date Amendment Flag Current Fiscal Year End Date Entity a Well-known Seasoned Issuer Entity a Voluntary Filer Entity's Reporting Status Current Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus ASSETS: Current assets: Cash Prepaid expenses Deferred offering costs Total current assets Investments and cash held in trust account Total assets LIABILITIES AND STOCKHOLDERS' EQUITY: Current liabilities: Accounts payable and accrued expenses Note payable Total current liabilities Deferred underwriting commissions Total liabilities Class A common stock subject to possible redemption; $0.0001 par value; 31,092,025 shares (at redemption value of $10.00 per share) as of March 31, 2017 Stockholders' equity: Preferred stock, $0.0001 par value, 1,000,000 shares authorized, none issued or outstanding Common stock Additional paid-in-capital Accumulated deficit Total stockholders' equity Total liabilities and stockholders' equity Preferred stock, par value (in dollars per share) Preferred stock, authorized Preferred stock, issued Preferred stock, outstanding Common stock, par value (in dollars per share) Common stock, authorized Common stock, issued Common stock, outstanding Temporary equity, par value (in dollars per share) Temporary equity, Redemption (in dollars per share) Temporary equity, authorized Income Statement [Abstract] Revenues General and administrative expenses Loss from operations Interest income Net loss Weighted average number of shares outstanding: Basic and diluted (in shares) Net loss per common share: Basic and diluted (in dollars per share) Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance at beginning Balance at beginning (in shares) Sale of Class A common stock to public Sale of Class A common stock to public (in shares) Forfeiture of Class F common stock to Sponsor Forfeiture of Class F common stock to Sponsor (in shares) Sale of 15,500,000 Private Placement Warrants Offering costs Class A common stock subject to possible redemption Class A common stock subject to possible redemption (in shares) Balance at ending Balance at ending (in shares) Number of shares issued Statement of Cash Flows [Abstract] Cash flows from operating activities: Changes in prepaid expenses Changes in accounts payable and accrued expenses Net cash used by operating activities Cash flows from investing activities: Cash deposited in Trust Account Interest earned in Trust Account Net cash used by investing activities Cash flows from financing activities: Proceeds from sale of Class A common stock to public Proceeds from sale of Class F common stock to the Sponsor Proceeds from sale of Private Placement Warrants Note payable borrowings and advance Note payable payment Payment of offering costs Net cash provided by financing activities Increase in cash Cash at beginning of period Cash at end of period Supplemental disclosure of non-cash financing activities: Deferred offering costs included in accrued offering costs Deferred underwriting commissions Organization, Consolidation and Presentation of Financial Statements [Abstract] Description of Organization and Business Operations Accounting Policies [Abstract] Summary of Significant Accounting Policies Public Offering Public Offering Related Party Transactions [Abstract] Related Party Transactions Investments And Cash Held In Trust Account Investments and Cash Held in Trust Account Fair Value Disclosures [Abstract] Fair Value Measurements Deferred Underwriting Commissions Deferred Underwriting Commissions Equity [Abstract] Stockholders' Equity Basis of Presentation Emerging Growth Company Net Loss Per Common Share Concentration of Credit Risk Financial Instruments Use of Estimates Offering Costs Redeemable Class A Common Stock Income Taxes Marketable Securities Held in Trust Account Recent Accounting Pronouncements Schedule of fair value assets measured on recurring basis Number of units sold Unit price (in dollars per share) Gross proceeds from units sold Warrant exercise price (in dollars per share) Gross proceeds from warrants issued Transaction costs Underwriting fees Public offering costs Cash deposited in Trust Account Contingent consideration Number of antidilutive shares Federal depository insurance coverage Number of shares issued in public offering Common stock redemption terms Number of shares classified outside of permanent equity Unit price (in dollars per unit) Gross proceeds from public offering Number of shares forfeited Description of unit Number of share consist in each unit Share price of whole share (in dollars per share) Share price of half share (in dollars per share) Warrant redemption terms Number of shares called by each warrant Value of shares issued Share price (in dollars per share) Description of stock split Common stock outstanding Number of shares subject to forfeiture Percentage of ownership after transaction Number of shares no longer subject to forfeiture Due from related party Repayment of related party debt Description of debt instrument terms Investments And Cash Held In Trust Account Details Narrative Cash Money market instrument Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Investments in money market fund held in Trust Account Total Percentage of cash underwriting fee Percentage of deferred underwriting commissions Information by type of related party. It represents as a cash deposited in trust account. Classification of common stock that has different rights than Common Class F, representing ownership interest in a corporation. Amount represents as a deferred offering costs included in accrued offering costs. Underwriting commission is in this category. We can not get all the benefit of this service within one year. That is the reason, we estimate written off value of underwriter commission and then we transfer same it in profit and loss account. Underwriting commission is in this category. We can not get all the benefit of this service within one year. That is the reason, we estimate written off value of underwriter commission and then we transfer same it in profit and loss account. Description of underwriting commission is in this category. We can not get all the benefit of this service within one year. That is the reason, we estimate written off value of underwriter commission and then we transfer same it in profit and loss account. Description of each Unit consists of one share of the company's Class. Disclosure of accounting policy for emerging growth company. The amount of interest incurred to a trust account on deposits. The entire disclosure for investments and cash held in trust account. Information by type of related party. Number of shares related to forfeited during the period. Disclosure of accounting policy for costs incurred in connection with the public offering cost. Costs incurred in connection with the public offering cost. The entire disclosure for costs incurred in connection with the public offering cost. Disclosure of accounting policy for redeemable class A common stock. Amount related to contingent consideration. Number of new stock issued during the period. Common stock redemption terms. Price of a single share of a number of saleable stocks of a company. Price of a single share of a number of saleable stocks of a company. Number of shares subject to forfeiture. Number of shares no longer subject to forfeiture. Percentage of cash underwriting fee. Percentage of deferred underwriting commissions. Term of warrant redemption. Assets, Current Assets Liabilities, Current Stockholders' Equity Attributable to Parent Liabilities and Equity General and Administrative Expense Increase (Decrease) in Prepaid Expense Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Repayments of Notes Payable Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash and Cash Equivalents, Period Increase (Decrease) DeferredUnderwritingCommissions1 PublicOfferingTextBlock DeferredUnderwritingCommissionsTextBlock Cash [Default Label]