Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Dec. 31, 2018
Subcontractors
Subsequent Event [Line Items]
Date of acquisition		Jan. 31, 2019
Subsequent Event | Subcontractors
Subsequent Event [Line Items]
Acquired purchase price	$ 13,200
Subsequent Event | Plan III Common Units Repurchase Program
Subsequent Event [Line Items]
Company's common units repurchased and retired	0.5
Average price paid per unit	$ 9.39
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Distribution declared	0.1175
Partners capital projected distribution amount on annualized basis	0.47
Minimum dividend distribution per unit	$ 0.0675
Amount to paid to common unit holders	$ 6,100
Amount to paid to the General Partner	200
Incentive distribution to the General Partner	160
Incentive distributions to management	$ 200
Dividend payable date	Feb. 05, 2019
Dividend record date	Jan. 28, 2019