0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Statements of Stockholders’ Equity link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Condensed Consolidated Statements of Stockholders’ Equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Business and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Acquisitions link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Revenue Recognition link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Equity Method Investments link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Fair Value of Financial Assets and Liabilities link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Other Current Assets and Accrued Expenses and Other Current Liabilities link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Preferred Stock and Common Stock link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Stock-Based Compensation link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Net Income (Loss) Per Share Attributable to Compass, Inc. link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Restructuring Activities link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Acquisitions (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Revenue Recognition (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Equity Method Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Goodwill and Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Other Current Assets and Accrued Expenses and Other Current Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Preferred Stock and Common Stock (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Stock-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Net Income (Loss) Per Share Attributable to Compass, Inc. (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Restructuring Activities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Business and Basis of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Summary of Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Acquisitions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Acquisitions - Schedule of Individual Elements Within the Calculation of Total Consideration Transferred (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Acquisitions - Schedule of Preliminary Allocation of Purchase Price to the Estimated Fair Values of Net Assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Acquisitions - Schedule of Fair Value of Identified Intangible Assets And Useful Lives at the Time of Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Acquisitions - Schedule of Costs Incurred in Connection with Merger (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Acquisitions - Schedule of Pro Forma Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Revenue Recognition - Schedule of Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Revenue Recognition - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Equity Method Investments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Equity Method Investments - Schedule of Equity Method Investment (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Equity Method Investments - Schedule of Equity in Income from its Equity Method Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value of Financial Assets and Liabilities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Fair Value of Financial Assets and Liabilities - Schedule of Principal Amount (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Fair Value of Financial Assets and Liabilities - Schedule of Fair Value of Level 3 Financial Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Fair Value of Financial Assets and Liabilities - Schedule of Balances of Level 3 Financial Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Fair Value of Financial Assets and Liabilities - Schedule of Balances of Level 3 Financial Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Leases - Schedule of Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Leases - Schedule of Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Leases - Schedule of Weighted-average Remaining Lease Term and Discount Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Leases - Schedule of Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Leases - Schedule of Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Leases - Schedule of Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Goodwill and Intangible Assets - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Goodwill and Intangible Assets - Schedule of Changes In The Carrying Amount Of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Goodwill and Intangible Assets - Schedule of Carrying Amounts and Accumulated Amortization of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Goodwill and Intangible Assets - Schedule of Carrying Amounts and Accumulated Amortization of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense for Finite-Lived Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Other Current Assets and Accrued Expenses and Other Current Liabilities - Schedule of Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Other Current Assets and Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Debt - Schedule of Borrowing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Debt - Schedule of Future Maturities for Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Debt - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Preferred Stock and Common Stock - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Preferred Stock and Common Stock - Schedule of Authorized, Issued and Outstanding Shares for Each Classes of Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Stock-Based Compensation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Stock-Based Compensation - Schedule of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Stock-Based Compensation - Schedule of Restricted Stock Units Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Net Income (Loss) Per Share Attributable to Compass, Inc. - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Net Income (Loss) Per Share Attributable to Compass, Inc. - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Net Income (Loss) Per Share Attributable to Compass, Inc. - Schedule of Computation of Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Restructuring Activities - Schedule of Total Costs Incurred in Connection With Restructuring Activities (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Restructuring Activities - Schedule of Estimated Timing of Company's Future Lease and Lease-Related Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Segment Information - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Segment Information - Schedule of Reconciliation to Net Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Segment Information - Schedule of Reconciliation to Net Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink