v3.26.1
FAIR VALUE MEASUREMENTS (Details) - Precision Strip Retirement and Savings Plan - USD ($)
Dec. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENTS    
Investments, at fair value $ 397,831,720 $ 364,732,370
Cash and cash equivalents    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 6,441,767 7,145,143
Mutual funds    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 63,553,490 65,458,970
Reliance, Inc. common stock    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 22,433,355 20,549,923
Self-directed brokerage accounts    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 1,322,574 847,744
Fair Value, Inputs, Level 1, Level 2, and Level 3    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 93,751,186 94,001,780
Level 1    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 93,751,186 94,001,780
Level 1 | Cash and cash equivalents    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 6,441,767 7,145,143
Level 1 | Mutual funds    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 63,553,490 65,458,970
Level 1 | Reliance, Inc. common stock    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 22,433,355 20,549,923
Level 1 | Self-directed brokerage accounts    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 1,322,574 847,744
Fair value at NAV | Commingled funds    
FAIR VALUE MEASUREMENTS    
Investments, at fair value 294,358,119 257,247,436
Fair value at NAV | Common collective trust    
FAIR VALUE MEASUREMENTS    
Investments, at fair value $ 9,722,415 $ 13,483,154