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Business Segments: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Details of reportable segment          
Operating revenues $ 115,641 $ 120,695 $ 217,586 $ 231,247  
Operating income (loss) 31,000 33,294 53,768 61,257  
Interest expense, net 5,655 5,628 11,170 11,219  
Utility plant 988,668 946,740 988,668 946,740 981,477
Depreciation and amortization expense 10,525 9,768 21,055 19,584 [1]  
Income tax expense (benefit) 10,262 11,148 16,619 20,397  
Capital additions 15,089 22,910 35,620 41,189  
GSWC
          
Details of reportable segment          
Number of reportable segments     2    
Operating revenues 94,560 92,466 175,773 172,433  
Operating income (loss) 28,575 28,958 49,005 52,554  
Utility plant 983,686   983,686   977,294
Depreciation and amortization expense 10,232 9,484 20,472 19,006  
Income tax expense (benefit) 9,783 9,643 15,488 17,306  
Depreciation on transportation equipment 225 218 497 468  
AWR
          
Details of reportable segment          
Number of reportable segments     3    
Reportable Entities | GSWC | Water
          
Details of reportable segment          
Operating revenues 86,232 84,069 156,989 153,302  
Operating income (loss) 27,182 26,772 45,577 48,535  
Interest expense, net 5,271 5,208 10,439 10,402  
Utility plant 943,382 901,505 943,382 901,505  
Depreciation and amortization expense 9,634 8,909 19,197 17,839 [1]  
Income tax expense (benefit) 9,374 8,821 14,332 15,762  
Capital additions 14,327 22,263 33,651 40,141  
Reportable Entities | GSWC | Electric
          
Details of reportable segment          
Operating revenues 8,328 8,397 18,784 19,131  
Operating income (loss) 1,393 2,186 3,428 4,019  
Interest expense, net 337 378 671 754  
Utility plant 40,304 40,993 40,304 40,993  
Depreciation and amortization expense 598 575 1,275 1,167 [1]  
Income tax expense (benefit) 409 822 1,156 1,544  
Capital additions 208 647 680 880  
Reportable Entities | ASUS | Contracts
          
Details of reportable segment          
Operating revenues 21,081 28,229 41,813 58,814  
Operating income (loss) 2,425 4,343 4,809 8,710  
Interest expense, net 55 93 122 153  
Utility plant 4,982 4,242 4,982 4,242  
Depreciation and amortization expense 293 284 583 578 [1]  
Income tax expense (benefit) 923 1,628 1,746 3,294  
Capital additions 554 0 1,289 168  
Intersegment Eliminations | AWR
          
Details of reportable segment          
Operating revenues 0 0 0 0  
Operating income (loss) 0 (7) (46) (7)  
Interest expense, net (8) (51) (62) (90)  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0 [1]  
Income tax expense (benefit) (444) (123) (615) (203)  
Capital additions $ 0 $ 0 $ 0     
[1] Depreciation expense computed on GSWC’s transportation equipment of $225,000 and $218,000 for the three months ended June 30, 2014 and 2013, respectively, and $497,000 and $468,000 for the six months ended June 30, 2014 and 2013, respectively, is recorded in administrative and general expenses.