Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies The accompanying unaudited condensed consolidated financial statements of PICO Holdings, Inc. and subsidiaries (collectively, the “Company” or “PICO”) have been prepared in accordance with the interim reporting requirements of Form 10-Q, pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for complete consolidated financial statements. In the opinion of management, all adjustments and reclassifications considered necessary for a fair and comparable presentation of the financial statements presented have been included and are of a normal recurring nature. Operating results presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC. Smaller Reporting Company The Company qualifies as a Smaller Reporting Company under the SEC’s definition and therefore certain disclosures that are no longer required have been removed in accordance with the SEC’s disclosure requirements for smaller reporting companies. Use of Estimates in Preparation of Financial Statements: The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses for each reporting period. The significant estimates made in the preparation of the Company’s condensed consolidated financial statements relate to the assessment of impairment losses, intangible assets, real estate and water assets, deferred income taxes, and stock-based compensation. It is reasonably possible that actual results could differ from the estimates upon which the carrying values were based. Recent Accounting Pronouncements: In February 2016, Financial Accounting Standards Board (“FASB”) issued guidance which establishes a right-of-use model that requires a lessee to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either "finance" or "operating," with classification affecting the pattern of expense recognition in the income statement. This update requires a modified retrospective transition as of the beginning of the earliest comparative period presented in the financial statements. This update is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. While the Company continues to assess all potential impacts of the guidance on existing leases and contracts, it currently believes the most significant impact relates to its accounting for office operating leases. The Company anticipates that the adoption of ASU 2016-02 will have an immaterial impact on the Company’s condensed consolidated financial statements. In January 2016, the Financial Accounting Standards Board (“FASB”) issued guidance which makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in earnings. Effective January 1, 2018, the Company adopted the new guidance and recorded a cumulative effect adjustment to decrease opening retained deficit at January 1, 2018 by $560,000 as required for equity investments recorded at fair value, formerly available-for-sale-securities. In May 2014, the FASB issued guidance regarding revenue from contracts with customers, which provides a consistent revenue accounting model across industries. The Company has reviewed this update and other guidance that was subsequently issued to further clarify the implementation guidance. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services and requires new disclosures about revenue. The Company adopted the guidance effective January 1, 2018 which did not have a material impact on its consolidated financial statements.

Basis of Presentation and Summary of Significant Accounting Policies

The accompanying unaudited condensed consolidated financial statements of PICO Holdings, Inc. and subsidiaries (collectively, the “Company” or “PICO”) have been prepared in accordance with the interim reporting requirements of Form 10-Q, pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for complete consolidated financial statements.

In the opinion of management, all adjustments and reclassifications considered necessary for a fair and comparable presentation of the financial statements presented have been included and are of a normal recurring nature. Operating results presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2018.

These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC.

Smaller Reporting Company

The Company qualifies as a Smaller Reporting Company under the SEC’s definition and therefore certain disclosures that are no longer required have been removed in accordance with the SEC’s disclosure requirements for smaller reporting companies.

Use of Estimates in Preparation of Financial Statements:

The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses for each reporting period. The significant estimates made in the preparation of the Company’s condensed consolidated financial statements relate to the assessment of impairment losses, intangible assets, real estate and water assets, deferred income taxes, and stock-based compensation. It is reasonably possible that actual results could differ from the estimates upon which the carrying values were based.

Recent Accounting Pronouncements:

In February 2016, Financial Accounting Standards Board (“FASB”) issued guidance which establishes a right-of-use model that requires a lessee to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either "finance" or "operating," with classification affecting the pattern of expense recognition in the income statement. This update requires a modified retrospective transition as of the beginning of the earliest comparative period presented in the financial statements. This update is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. While the Company continues to assess all potential impacts of the guidance on existing leases and contracts, it currently believes the most significant impact relates to its accounting for office operating leases. The Company anticipates that the adoption of ASU 2016-02 will have an immaterial impact on the Company’s condensed consolidated financial statements.

In January 2016, the Financial Accounting Standards Board (“FASB”) issued guidance which makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in earnings. Effective January 1, 2018, the Company adopted the new guidance and recorded a cumulative effect adjustment to decrease opening retained deficit at January 1, 2018 by $560,000 as required for equity investments recorded at fair value, formerly available-for-sale-securities.

In May 2014, the FASB issued guidance regarding revenue from contracts with customers, which provides a consistent revenue accounting model across industries. The Company has reviewed this update and other guidance that was subsequently issued to further clarify the implementation guidance. Under this guidance, revenue is recognized as the transfer of goods and services to customers takes place and in amounts that reflect the payment or payments that are expected to be received from the customers for those goods and services and requires new disclosures about revenue. The Company adopted the guidance effective January 1, 2018 which did not have a material impact on its consolidated financial statements.