Construction Services Noncontrolling Interests - Additional Information (Detail) - Principal Previous Owners [Member] - Link-Line and WS Nicholls [Member]	1 Months Ended	9 Months Ended
	Oct. 31, 2014	Sep. 30, 2016
Noncontrolling Interest [Line Items]
First redemption date to exchange holdings for cash		2017-07
Description of equity interest		In conjunction with the acquisition of the Canadian construction businesses in October 2014, the previous owners of the acquired companies currently hold a 3.4% equity interest (a noncontrolling interest) in Centuri. The noncontrolling parties are able to exit their investment retained by requiring the purchase of a portion of their interest commencing July 2017 and in incremental amounts each anniversary date thereafter. The shares subject to the election cumulate (if earlier elections are not made) such that 100% of their interest retained is subject to the election beginning in July 2022.
Construction Services [Member]
Noncontrolling Interest [Line Items]
Percentage of earnings attribution by Centuri to previous owners	3.40%
Construction Services [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Percentage of retained interest may elect to sell to Centuri		100.00%