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Subsequent Events - Additional Information (Detail) - Subsequent Event
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended
Apr. 30, 2019
USD ($)
$ / shares
shares
Plan III Common Units Repurchase Program  
Subsequent Event [Line Items]  
Company's common units repurchased and retired | shares 0.2
Average price paid per unit | $ / shares $ 9.67
Dividend Declared  
Subsequent Event [Line Items]  
Distribution declared | $ / shares 0.125
Partners capital projected distribution amount on annualized basis | $ / shares 0.50
Minimum dividend distribution per unit | $ / shares $ 0.0675
Amount to paid to common unit holders | $ $ 6,300
Amount to paid to the General Partner | $ 230
Incentive distribution to the General Partner | $ 200
Incentive distributions to management | $ $ 200
Dividend payable date May 06, 2019
Dividend record date Apr. 26, 2019