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Balancing and Memorandum Account Recovery Procedures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance $ 21,705 $ 25,909
Regulatory Asset Increase (Decrease) (2,031) 4,335
Refunds (Collections) 2 (6,253)
Surcharge Offset 0 76
Ending Balance 19,676 24,067
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 6,220 0
Regulatory Asset Increase (Decrease) (321) 0
Refunds (Collections) 0 0
Surcharge Offset 0 0
Ending Balance 5,899 0
Balancing and Memorandum Account [Roll Forward]    
Beginning Balance 27,925 25,909
Regulatory Asset Increase (Decrease) (2,352) 4,335
Refunds (Collections) 2 (6,253)
Surcharge Offset 0 76
Ending Balance 25,575 24,067
Regulatory Balancing and Memorandum Accounts, Net Under-Collected 3,910  
2014-2016 WCMA    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 190 1,589
Regulatory Asset Increase (Decrease) 79 1,448
Refunds (Collections) 1 (1,232)
Surcharge Offset 0 (1,407)
Ending Balance 270 398
2017 WCMA    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance [1] 6,489 0
Regulatory Asset Increase (Decrease) [1] 296 2,060
Refunds (Collections) [1] 0 0
Surcharge Offset [1] 0 (2,060)
Ending Balance [1] 6,785 0
2018 WCMA    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 0
Regulatory Asset Increase (Decrease) (708) 0
Refunds (Collections) 0 0
Surcharge Offset 0 0
Ending Balance (708) 0
Balancing and Memorandum Account [Roll Forward]    
Memorandum Account, Revenue Increase (Reduction) (708)  
2012 General Rate Case true-up    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 11,319 20,682
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) 1 (2,258)
Surcharge Offset 0 0
Ending Balance 11,320 18,424
2015 General Rate Case true-up    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 115 5,528
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) 0 (1,431)
Surcharge Offset 0 0
Ending Balance 115 4,097
Cost of capital    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance (144) (817)
Regulatory Asset Increase (Decrease) (1,165) 0
Refunds (Collections) 0 358
Surcharge Offset 0 0
Ending Balance (1,309) (459)
Tax memorandum    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 0
Regulatory Asset Increase (Decrease) (933) 0
Refunds (Collections) 0 0
Surcharge Offset 0 0
Ending Balance (933) 0
Drought surcharges    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 (7,688)
Regulatory Asset Increase (Decrease) 0 0
Refunds (Collections) 0 (833)
Surcharge Offset 0 3,467
Ending Balance 0 (5,054)
Water supply costs    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 5,190
Regulatory Asset Increase (Decrease) 0 197
Refunds (Collections) 0 297
Surcharge Offset 0 0
Ending Balance 0 5,684
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance 8,679 0
Regulatory Asset Increase (Decrease) (482) 0
Refunds (Collections) 0 0
Surcharge Offset 0 0
Ending Balance 8,197 0
Pension    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 0 (2,009)
Regulatory Asset Increase (Decrease) 0 173
Refunds (Collections) 0 (703)
Surcharge Offset 0 0
Ending Balance 0 (2,539)
Balancing and Memorandum Cost Recovery Account [Roll Forward]    
Beginning Balance (2,459) 0
Regulatory Asset Increase (Decrease) 161 0
Refunds (Collections) 0 0
Surcharge Offset 0 0
Ending Balance (2,298) 0
All others    
Balancing and Memorandum Revenue Account [Roll Forward]    
Beginning Balance 3,736 3,434
Regulatory Asset Increase (Decrease) 400 457
Refunds (Collections) 0 (451)
Surcharge Offset 0 76
Ending Balance 4,136 3,516
2017 WCMA Reserve Recorded [Member]    
Balancing and Memorandum Account [Roll Forward]    
Memorandum Account, Revenue Increase (Reduction) $ 1,022 $ 0
[1] As of March 31, 2018 and 2017, the reserve balance for the 2017 WCMA was $1,022 and $0, which has been netted from the balance above.