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Business Segments: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Details of reportable segment          
Total operating revenues $ 138,327 $ 130,914 $ 355,913 $ 362,161  
Operating income (loss) 39,895 36,164 93,663 97,421  
Interest expense, net 5,295 5,667 16,465 16,886  
Utility plant 995,443 968,459 995,443 968,459 981,477
Depreciation and amortization expense 10,549 9,753 31,604 29,337 [1]  
Income tax expense (benefit) 13,476 9,905 30,095 30,302  
Capital additions 18,094 27,870 53,714 69,059  
GSWC
          
Details of reportable segment          
Number of reportable segments     2    
Total operating revenues 105,314 102,781 281,087 275,214  
Operating income (loss) 32,346 32,284 81,351 84,838  
Utility plant 990,589   990,589   977,294
Depreciation and amortization expense 10,236 9,474 30,708 28,480  
Income tax expense (benefit) 11,019 10,251 26,507 27,557  
Depreciation on transportation equipment 201 214 698 682  
AWR
          
Details of reportable segment          
Number of reportable segments     3    
Reportable Legal Entities [Member] | GSWC | Water
          
Details of reportable segment          
Total operating revenues 96,700 93,932 253,689 247,234  
Operating income (loss) 31,185 31,022 76,762 79,557  
Interest expense, net 4,976 5,297 15,415 15,699  
Utility plant 950,256 923,521 950,256 923,521  
Depreciation and amortization expense 9,643 8,900 28,840 26,739 [1]  
Income tax expense (benefit) 10,749 9,812 25,081 25,574  
Capital additions 17,093 27,256 50,744 67,397  
Reportable Legal Entities [Member] | GSWC | Electric
          
Details of reportable segment          
Total operating revenues 8,614 8,849 27,398 27,980  
Operating income (loss) 1,161 1,262 4,589 5,281  
Interest expense, net 319 370 990 1,124  
Utility plant 40,333 40,904 40,333 40,904  
Depreciation and amortization expense 593 574 1,868 1,741 [1]  
Income tax expense (benefit) 270 439 1,426 1,983  
Capital additions 726 546 1,406 1,426  
Reportable Legal Entities [Member] | ASUS | Contracts
          
Details of reportable segment          
Total operating revenues 33,013 28,133 74,826 86,947  
Operating income (loss) 7,549 3,882 12,358 12,592  
Interest expense, net 10 (71) 132 224  
Utility plant 4,854 4,034 4,854 4,034  
Depreciation and amortization expense 313 279 896 857 [1]  
Income tax expense (benefit) 2,857 1,343 4,603 4,637  
Capital additions 275 68 1,564 236  
Intersegment Eliminations | AWR
          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) 0 (2) (46) (9)  
Interest expense, net (10) (71) (72) (161)  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0 [1]  
Income tax expense (benefit) (400) (1,689) (1,015) (1,892)  
Capital additions $ 0 $ 0 $ 0     
[1] Depreciation expense computed on GSWC’s transportation equipment of $201,000 and $214,000 for the three months ended September 30, 2014 and 2013, respectively, and $698,000 and $682,000 for the nine months ended September 30, 2014 and 2013, respectively, is recorded in administrative and general expenses.