Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Business Acquisition [Line Items] |
|
|
|
|
| Net income (loss) attributable to common unitholders |
$ 10,832
|
$ (12,143)
|
$ 22,003
|
$ 76,867
|
| Compensation cost |
|
|
1,900
|
|
| API Group plc (API) |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Total revenue |
|
|
979,136
|
1,069,762
|
| Net income from continuing operations |
|
|
$ 24,143
|
$ 11,114
|
| Net income (loss) per common unit - basic (in dollars per share) |
|
|
$ 0.71
|
$ 0.71
|
| Net income (loss) per common unit - diluted (in dollars per share) |
|
|
$ 0.71
|
$ 0.71
|
| Minimum | Other intangible assets |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Useful life (in years) |
|
|
10 years
|
|
| Minimum | Order backlog |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Useful life (in years) |
|
|
2 months
|
|
| Maximum | Other intangible assets |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Useful life (in years) |
|
|
15 years
|
|
| Maximum | Order backlog |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Useful life (in years) |
|
|
8 months
|
|
| HNH, JPS, SLI, and API | Acquisition-related costs |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Net income (loss) attributable to common unitholders |
|
|
|
$ 8,700
|
| HNH, SLI, and EME | Acquisition-related costs |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Net income (loss) attributable to common unitholders |
|
|
$ 6,900
|
|
| SL Industries, Inc. (SLI) | Fair Value Adjustment to Inventory |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Net income (loss) attributable to common unitholders |
|
|
$ 1,900
|
|
| JPS and API [Member] | Fair Value Adjustment to Inventory |
|
|
|
|
| Business Acquisition [Line Items] |
|
|
|
|
| Net income (loss) attributable to common unitholders |
|
|
|
$ 4,375
|