Shareholder Report |
12 Months Ended | ||||||||||||||||||||||||||||||
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Dec. 31, 2025
USD ($)
$ / shares
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| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||
| Document Type | N-CSR | ||||||||||||||||||||||||||||||
| Amendment Flag | false | ||||||||||||||||||||||||||||||
| Registrant Name | Wilshire Variable Insurance Trust | ||||||||||||||||||||||||||||||
| Entity Central Index Key | 0001026708 | ||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | ||||||||||||||||||||||||||||||
| Document Period End Date | Dec. 31, 2025 | ||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||||||||||||||
| Wilshire Global Allocation Fund | |||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||||||||||||||
| Fund Name | Wilshire Global Allocation Fund | ||||||||||||||||||||||||||||||
| Class Name | Wilshire Global Allocation Fund | ||||||||||||||||||||||||||||||
| No Trading Symbol | true | ||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Wilshire Global Allocation Fund (the “Fund”) for the period of January 1, 2025, to December 31, 2025. | ||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.wilshire.com/research-insights/product-literature. You can also request this information by contacting us at 1-866-591-1658. | ||||||||||||||||||||||||||||||
| Additional Information Phone Number | 1-866-591-1658 | ||||||||||||||||||||||||||||||
| Additional Information Website | https://www.wilshire.com/research-insights/product-literature | ||||||||||||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 49 | ||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.45% | ||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? The Global Allocation Fund returned 17.41% in 2025, outperforming the Custom Benchmark return of 15.86%. The U.S. stock market, represented by the FT Wilshire 5000 IndexSM, was up 17.13% for the past year. Sector performance was positive across all sectors with information technology (+22.81%), industrials (+18.18%) and communication services (+31.77%) leading the market. From a size perspective, FT Wilshire Small Cap IndexSM underperformed FT Wilshire Large Cap IndexSM by 9.78% for the 1-year period. Growth stocks continued to outperform Value stocks during the year. Performance results within international equity markets were positive for the year. Both Non U.S. Developed and emerging market equities outperformed U.S. equities by a significant margin. Active management faced persistant headwind as mega capitalization stocks continued to perform well relative to the rest of the equities market. Credit oriented fixed income investments such as high yield, marginally outperformed the Bloomberg U.S. Aggregate Bond Index for the year.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of how the Fund will perform in the future. | ||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | ![]() |
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| Average Annual Return [Table Text Block] | ANNUAL AVERAGE TOTAL RETURN (%)
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| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | ||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | Visit https://www.wilshire.com/research-insights/product-literature for more recent performance information.
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| Net Assets | $ 508,084,713 | ||||||||||||||||||||||||||||||
| Holdings Count | $ / shares | 10 | ||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 565,158 | ||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 22.00% | ||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of December 31, 2025)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of December 31, 2025)
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| Updated Prospectus Web Address | https://www.wilshire.com/research-insights/product-literature | ||||||||||||||||||||||||||||||