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Revenue Recognition - Schedule of Impact of Adoption on Condensed Consolidated Statement of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sales:                        
Total sales $ 235,887 $ 283,376 $ 699,582 $ 535,027 $ 229,618 $ 327,354 $ 684,031 $ 436,834   $ 1,753,872 $ 1,677,837 $ 1,323,555
Cost and expenses:                        
Delivery and branch expenses                   369,033 357,580 306,534
Operating income (loss) (43,782) (29,933) 105,002 6,063 (41,654) (8,817) 85,473 31,066   37,350 66,068 55,332
Income (loss) before income taxes (46,545) (33,153) 101,564 3,288 (36,925) (11,421) 82,783 28,670 $ 34,400 25,154 63,107 47,276
Income tax expense (benefit)                   7,517 7,602 20,376
Net income (loss) (33,905) (23,098) 72,325 2,315 (21,450) (8,005) 54,778 30,182   17,637 55,505 26,900
General Partner's interest in net income (loss)                   95 314 156
Limited Partner's interest in net income (loss) $ (33,681) $ (22,948) $ 71,871 $ 2,300 $ (21,319) $ (7,956) $ 54,459 $ 30,007   $ 17,542 $ 55,191 $ 26,744
Basic and diluted income (loss) per Limited Partner Unit $ (0.69) [1] $ (0.46) [1] $ 1.15 [1] $ 0.04 [1] $ (0.40) [1] $ (0.15) [1] $ 0.81 [1] $ 0.45 [1]   $ 0.35 [1],[2] $ 0.89 [1],[2] $ 0.46 [2]
Balances Without Adoption of ASC 606 | ASU 2014-09                        
Sales:                        
Total sales                   $ 1,758,737    
Cost and expenses:                        
Delivery and branch expenses                   372,290    
Operating income (loss)                   38,958    
Income (loss) before income taxes                   26,762    
Income tax expense (benefit)                   7,998    
Net income (loss)                   18,764    
General Partner's interest in net income (loss)                   101    
Limited Partner's interest in net income (loss)                   $ 18,663    
Basic and diluted income (loss) per Limited Partner Unit                   $ 0.37    
Effect of Change Higher/(Lower) | ASU 2014-09                        
Sales:                        
Total sales                   $ (4,865)    
Cost and expenses:                        
Delivery and branch expenses                   (3,257)    
Operating income (loss)                   (1,608)    
Income (loss) before income taxes                   (1,608)    
Income tax expense (benefit)                   (481)    
Net income (loss)                   (1,127)    
General Partner's interest in net income (loss)                   (6)    
Limited Partner's interest in net income (loss)                   $ (1,121)    
Basic and diluted income (loss) per Limited Partner Unit                   $ (0.02)    
Product                        
Sales:                        
Total sales                   $ 1,466,045 $ 1,404,370 $ 1,065,076
Product | Balances Without Adoption of ASC 606 | ASU 2014-09                        
Sales:                        
Total sales                   1,477,488    
Product | Effect of Change Higher/(Lower) | ASU 2014-09                        
Sales:                        
Total sales                   (11,443)    
Installations and services                        
Sales:                        
Total sales                   287,827 $ 273,467 $ 258,479
Installations and services | Balances Without Adoption of ASC 606 | ASU 2014-09                        
Sales:                        
Total sales                   281,249    
Installations and services | Effect of Change Higher/(Lower) | ASU 2014-09                        
Sales:                        
Total sales                   $ 6,578    
[1] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.
[2] See Note 19 - Earnings Per Limited Partner Units.