Business Combinations - Additional Information (Details) - USD ($) $ in Thousands										3 Months Ended		9 Months Ended
		Sep. 28, 2017	Jun. 09, 2017	Feb. 24, 2017	Dec. 14, 2016	Nov. 30, 2016	Sep. 09, 2016	Jan. 27, 2016	Jan. 22, 2016	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Business Acquisition [Line Items]
Operating revenues	[1]									$ 27,744	$ 26,116	$ 54,319	$ 46,735
Increased operating income from acquisition (less than)										16,391	15,474	21,104	18,100
Kern Acquisition
Business Acquisition [Line Items]
Aggregate purchase price									$ 29,200
Net assets acquired			$ 3,200	$ 6,000		$ 8,400	$ 9,200	$ 4,900
Business combination capital contribution received from tax equity investor			$ 6,300	$ 8,200	$ 6,700	$ 1,300	$ 1,800		$ 900
Kern Acquisition | Maximum
Business Acquisition [Line Items]
Aggregate purchase price								$ 36,700
Kern Phase 2(b) Assets
Business Acquisition [Line Items]
Operating revenues										300		500
Increased operating income from acquisition (less than)											100		200
Kern Phase 2(c) Assets
Business Acquisition [Line Items]
Operating revenues										$ 300		$ 500
Increased operating income from acquisition (less than)											$ 100		$ 200
Subsequent event | Kern Acquisition
Business Acquisition [Line Items]
Business combination capital contribution received from tax equity investor		$ 4,000

[1] The Partnership has related-party activities for transactions made with the Sponsors. Related party transactions recorded within “Operating revenues” in the unaudited condensed consolidated statement of operations were $1.3 million for each of the three months ended August 31, 2017 and August 31, 2016, and $3.9 million for each of the nine months ended August 31, 2017 and August 31, 2016. Related party transactions recorded within “Operating costs and expenses” in the unaudited condensed consolidated statement of operations were $2.1 million and $1.9 million for the three months ended August 31, 2017 and August 31, 2016, respectively, and $6.3 million and $5.0 million for the nine months ended August 31, 2017 and August 31, 2016, respectively.