v3.26.1
Related Party Transactions - Summary of Revenues From Contracts With Customers Including Affiliated Services and Third-party Services on Disaggregated Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax $ 388.7 $ 381.0
Other income 1.4 1.0
Total revenues 390.1 382.0
Affiliate    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax 373.1 374.3
Affiliate | Oil and Gas Gathering Services    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax 166.3 171.5
Affiliate | Processing and Storage Services    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax 139.1 143.6
Affiliate | Terminaling and Export Services    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax 36.1 29.5
Affiliate | Water Gathering and Disposal Services    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax 31.6 29.7
Third Party    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer including assessed tax $ 15.6 $ 6.7