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Component: (Network and Table)
Network
1044 - Disclosure - Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail)
(http://www.swgas.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfIntangibleAssets)
TableSchedule of Finite-Lived Intangible Assets [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000092416 (http://www.sec.gov/CIK)
Legal Entity [Axis]Centuri Construction Group Inc [Member]
Finite-Lived Intangible Assets [Line Items]Period [Axis]
2016-12-31
2015-12-31
Finite-Lived Intangible Assets by Major Class [Axis]Finite-Lived Intangible Assets by Major Class [Axis]
Customer Relationships [Member]Trade Names and Trademarks [Member]Customer Contracts Backlog [Member]Noncompete Agreement [Member]Finite-Lived Intangible Assets, Major Class Name [Domain]Customer Relationships [Member]Trade Names and Trademarks [Member]Customer Contracts Backlog [Member]Noncompete Agreement [Member]Finite-Lived Intangible Assets, Major Class Name [Domain]
Gross Carrying Amount
34,033,000  
9,349,000  
1,656,000  
1,029,000  
46,067,000  
31,226,000  
8,621,000  
1,606,000  
437,000  
41,890,000  
Accumulated Amortization
(3,906,000) 
(2,565,000) 
(1,656,000) 
(271,000) 
(8,398,000) 
(2,070,000) 
(1,331,000) 
(1,606,000) 
(110,000) 
(5,117,000) 
Net Carrying Amount
30,127,000  
 
6,784,000  
 
0  
 
758,000  
 
37,669,000  
 
29,156,000  
 
7,290,000  
 
0  
 
327,000  
 
36,773,000