Earnings Per Unit Calculation - Schedule of Partnership's Basic Earnings (Loss) Per Common and Subordinated Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands |
2 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2013 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | ||||||||||||
| Net income | $ 28,379 | $ 8,580 | $ (2,550) | $ 43,939 | $ 65,588 | $ (5,302) | $ (10,604) | $ 73,132 | $ 78,348 | $ 122,814 | $ (29,838) | |
| Predecessor income through October 29, 2013 | 0 | 0 | (2,734) | |||||||||
| Income attributable to Kildair (Note 2) | 0 | (4,080) | 2,338 | |||||||||
| Distributions declared | 42,090 | 35,490 | 5,692 | |||||||||
| Assumed net income from operations after distributions | 36,258 | 83,244 | (35,926) | |||||||||
| Assumed net income to be allocated | $ (32,572) | $ 28,212 | $ 8,475 | $ (2,599) | $ 43,939 | $ 63,611 | $ (10,718) | $ (9,494) | $ 75,335 | $ 78,027 | $ 118,734 | $ (30,234) |
| Income per unit - basic | $ 1.34 | $ 0.40 | $ (0.12) | $ 2.10 | $ 3.13 | $ (0.53) | $ (0.47) | $ 3.74 | $ 3.71 | $ 5.88 | $ (1.50) | |
| Income per unit - diluted | $ 1.32 | $ 0.39 | $ (0.12) | $ 2.06 | $ 3.07 | $ (0.53) | $ (0.47) | $ 3.74 | $ 3.65 | $ 5.84 | $ (1.50) | |
| Common Unitholders - Affiliated [Member] | ||||||||||||
| Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | ||||||||||||
| Net income | $ 40,689 | |||||||||||
| Distributions declared | 21,826 | $ 17,964 | $ 2,846 | |||||||||
| Assumed net income from operations after distributions | $ 18,863 | 41,579 | (17,963) | |||||||||
| Assumed net income to be allocated | $ 59,543 | $ (15,117) | ||||||||||
| Income per unit - basic | $ 3.71 | $ 5.88 | $ (1.50) | |||||||||
| Income per unit - diluted | $ 3.65 | $ 5.84 | $ (1.50) | |||||||||
| Subordinated Unitholders - Affiliated [Member] | ||||||||||||
| Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | ||||||||||||
| Net income | $ 37,338 | |||||||||||
| Distributions declared | 19,943 | $ 17,526 | $ 2,846 | |||||||||
| Assumed net income from operations after distributions | $ 17,395 | 41,665 | (17,963) | |||||||||
| Assumed net income to be allocated | $ 59,191 | $ (15,117) | ||||||||||
| Income per unit - basic | $ 3.71 | $ 5.88 | $ (1.50) | |||||||||
| Income per unit - diluted | $ 3.71 | $ 5.88 | $ (1.50) | |||||||||
| Incentive Distribution Rights [Member] | ||||||||||||
| Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | ||||||||||||
| Net income | $ 321 | |||||||||||
| Distributions declared | 321 | |||||||||||
| Assumed net income from operations after distributions | $ 0 | |||||||||||