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Summary of Significant Accounting Policies - Balancing and Memorandum Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue accounts:      
Beginning Balance $ (1,940) $ 25,549  
Regulatory Asset Increase (Decrease) 2,516 (4,984)  
Refunds (Collections) Adjustments 9,467 (22,505)  
Ending Balance 10,043 (1,940) $ 25,549
Cost-recovery accounts:      
Beginning Balance 7,223 8,864  
Regulatory Asset Increase (Decrease) 8,324 962  
Refunds (Collections) Adjustments (127) (2,603)  
Ending Balance 15,420 7,223 8,864
Balancing and Memorandum Account [Roll Forward]      
Beginning Balance 5,283 34,413  
Regulatory Asset Increase (Decrease) 10,840 (4,022)  
Refunds (Collections) Adjustments 9,340 (25,108)  
Ending Balance 25,463 5,283 34,413
Monterey WRAM      
Revenue accounts:      
Beginning Balance 7,015 6,847  
Regulatory Asset Increase (Decrease) 2,464 4,582  
Refunds (Collections) Adjustments 2,598 (4,414)  
Ending Balance 12,077 7,015 6,847
2014 - 2017 WCMA      
Revenue accounts:      
Beginning Balance 708 7,750  
Regulatory Asset Increase (Decrease) 0 0  
Refunds (Collections) Adjustments (42) (7,042)  
Ending Balance 666 708 7,750
2018 WCMA      
Revenue accounts:      
Beginning Balance 0 9,386  
Regulatory Asset Increase (Decrease)   (9,386)  
Refunds (Collections) Adjustments   0  
Ending Balance   0 9,386
2012 General Rate Case true-up      
Revenue accounts:      
Beginning Balance 752 11,328  
Regulatory Asset Increase (Decrease) 0 96  
Refunds (Collections) Adjustments 0 (10,672)  
Ending Balance 752 752 11,328
Cost of capital memorandum accounts      
Revenue accounts:      
Beginning Balance (1,553) (1,523)  
Regulatory Asset Increase (Decrease) (8) (30) (1,379)
Refunds (Collections) Adjustments 0 0  
Ending Balance (1,561) (1,553) (1,523)
Tax memorandum account      
Revenue accounts:      
Beginning Balance (6,643) (6,504)  
Regulatory Asset Increase (Decrease) (2) (139) (6,504)
Refunds (Collections) Adjustments 6,978 0  
Ending Balance 333 (6,643) (6,504)
Water supply costs      
Cost-recovery accounts:      
Beginning Balance 4,328 9,617  
Regulatory Asset Increase (Decrease) 3,828 207  
Refunds (Collections) Adjustments (33) (5,496)  
Ending Balance 8,123 4,328 9,617
Pension      
Cost-recovery accounts:      
Beginning Balance 2,449 (1,843)  
Regulatory Asset Increase (Decrease) 1,008 745  
Refunds (Collections) Adjustments 21 3,547  
Ending Balance 3,478 2,449 (1,843)
PRVMA      
Cost-recovery accounts:      
Beginning Balance 0    
Regulatory Asset Increase (Decrease) 1,219    
Refunds (Collections) Adjustments (111)    
Ending Balance 1,108 0  
CEMA      
Cost-recovery accounts:      
Beginning Balance 0    
Regulatory Asset Increase (Decrease) 2,266    
Refunds (Collections) Adjustments 0    
Ending Balance 2,266 0  
All others      
Revenue accounts:      
Beginning Balance (2,219) (1,735)  
Regulatory Asset Increase (Decrease) 62 (107)  
Refunds (Collections) Adjustments (67) (377)  
Ending Balance (2,224) (2,219) (1,735)
Cost-recovery accounts:      
Beginning Balance 446 1,090  
Regulatory Asset Increase (Decrease) 3 10  
Refunds (Collections) Adjustments (4) (654)  
Ending Balance $ 445 $ 446 $ 1,090