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Utility Infrastructure Services Noncontrolling Interests - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2017
Dec. 31, 2018
Nov. 30, 2018
Jul. 31, 2018
Mar. 31, 2018
Jul. 31, 2017
Noncontrolling Interest [Line Items]            
Purchase price of the previous owners' equity interest in Centuri $ 23.0          
Percentage of equity interest acquired 3.40%          
Percentage of interest retained by noncontrolling party subject to election   100.00%        
Redeemable noncontrolling interest, fair value     $ 81.7      
Centuri            
Noncontrolling Interest [Line Items]            
Ownership percentage by noncontrolling owners       3.40%    
Percentage of equity interest acquired 3.40%          
Ownership percentage by parent           96.60%
Linetec            
Noncontrolling Interest [Line Items]            
Ownership percentage by noncontrolling owners     20.00%      
IntelliChoice Energy LLC            
Noncontrolling Interest [Line Items]            
Ownership percentage by noncontrolling owners     35.00%      
Centuri | IntelliChoice Energy LLC            
Noncontrolling Interest [Line Items]            
Ownership percentage by parent   95.00%     65.00%