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Share Based Compensation Plans (2012 LTIP Phantom Units Activity) (Detail) - Predecessor - USD ($)
8 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Distribution equivalent rights paid on unissued units under incentive plans $ 11,000 $ 558,000 $ 2,158,000
Phantom Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Distribution equivalent rights paid on unissued units under incentive plans $ 15,000 $ 700,000 $ 2,000,000
Outstanding, beginning of year (Units) 302,105 799,192 839,808
Granted (in units) 30,000 9,730 264,173
Vested and issued (Units) 24,679 472,278 274,414
Forfeited (Units) 60,639 34,539 30,375
Outstanding, end of year (Units) 0 302,105 799,192
Phantom Units | General and Administrative Expense      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Non-cash compensation expense recognized $ 500,000 $ 4,100,000 $ 6,400,000
Unrecognized compensation expense related to unvested units $ 800,000