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Background, Organization and Summary of Significant Accounting Policies - Schedule of Estimated Future Amortization of Intangible Assets (Detail) - Centuri - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
2019 $ 10,622  
2020 10,634  
2021 10,214  
2022 10,127  
2023 10,127  
Thereafter 108,097  
Net Carrying Amount $ 159,821 $ 80,702