Formation and Organization - Organization (Details) - $ / shares	Aug. 01, 2014	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2015	Jul. 08, 2015	May 29, 2014	Apr. 22, 2014
Class of Stock [Line Items]
Percent of stock offered	21.82%
Common Class B
Class of Stock [Line Items]
Percent of stock offered	78.18%
Common stock, shares	10,750,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common Class A
Class of Stock [Line Items]
Percent of stock offered	21.82%
Common stock, shares	3,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01				$ 0.01
Common Class A \| IPO
Class of Stock [Line Items]
Common stock, shares	3,000,000
Common stock, par value (in dollars per share)	$ 0.01
NuDevco Retail Holdings \| Common Class B
Class of Stock [Line Items]
Common stock, shares to be issued	10,612,500
NuDevco Retail Holdings \| Common Class A
Class of Stock [Line Items]
Common stock, shares to be issued	2,778
Spark HoldCo \| Common Class A
Class of Stock [Line Items]
Common stock, shares to be issued	2,997,222
NuDevco Retail Holdings \| Common Class B
Class of Stock [Line Items]
Common stock, shares	10,612,500
NuDevco Retail Holdings \| Spark HoldCo
Class of Stock [Line Items]
Percent of stock offered	77.18%
NuDevco Retail Holdings \| Spark Energy, Inc
Class of Stock [Line Items]
Percent of stock offered	21.82%
NuDevco Retail Holdings \| Spark Energy, Inc \| Common Class A
Class of Stock [Line Items]
Percent of stock offered	21.82%
NuDevco Retail \| Spark HoldCo
Class of Stock [Line Items]
Percent of stock offered	1.00%					1.00%