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Commitments Narrative (Details)
$ in Thousands, gal in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2013
Dec. 31, 2015
USD ($)
employee
acre_foot
agreement
$ / million_gallons
gal
Dec. 31, 2014
USD ($)
gal
Dec. 31, 2013
USD ($)
gal
Dec. 31, 1997
Long-term Purchase Commitment [Line Items]          
Purchased water   $ 61,089 $ 47,280 $ 63,225  
Reduction in delivery schedule   20.00%      
Intangible assets   $ 22,675 $ 19,333    
Other Commitment, Due in Next Twenty-Four Months   $ 46,900      
Number of water agreements | agreement   180      
Collective Bargaining Agreement, Term of Contract 3 years        
Collective bargaining agreement percent of wage increase for 2014 2.00%        
Collective bargaining agreement percent of wage increase for 2015 2.00%        
Collective bargaining agreement percent of wage increase for 2016 3.00%        
Santa Clara Valley Water District [Member]          
Long-term Purchase Commitment [Line Items]          
Master contract, negotiated term for delivery schedules   3 years      
Water purchased in millions of gallons | gal   18,482 17,782 22,700  
Purchased water   $ 52,553 $ 44,444 $ 52,500  
Minimum percent of delivery schedule to be purchased in 2016   90.00%      
Minimum volume of water to be purchased in 2016 | gal   19,360      
Cost of water to be purchased in 2016   $ 59,060      
Current contract water rate | $ / million_gallons   3.1      
Service Agreements [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino         25 years
Intangible assets   $ 12,059      
Concession Fees [Member]          
Long-term Purchase Commitment [Line Items]          
Intangible assets   $ 6,800 $ 6,800    
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Guadalupe-Blanco River Authority [Member]          
Long-term Purchase Commitment [Line Items]          
Long-term Purchase Commitment, Minimum Area Required, Next Twelve Months | acre_foot   6,900      
Notice period required for contract adjustment   60 days      
SJW Corp. [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   357      
Executive, Administrative or Supervisory Personnel [Member] | SJW Corp. [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   122      
Union Member [Member] | SJW Corp. [Member]          
Long-term Purchase Commitment [Line Items]          
Number of employees | employee   235      
Minimum [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino   5 years      
Water property rights commitments   $ 1,000      
Maximum [Member]          
Long-term Purchase Commitment [Line Items]          
Contract life of agreement with City of Cupertino   70 years      
Water property rights commitments   $ 1,300