Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
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3 Months Ended |
12 Months Ended |
Mar. 31, 2016 |
Mar. 31, 2015 |
Mar. 05, 2015 |
Jul. 11, 2014 |
Mar. 31, 2014 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Units withheld for employee tax obligation |
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$ 2,343
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$ 136
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| Unit-based compensation recorded in unitholders' equity |
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8,436
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8,182
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$ 6
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| Director [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Estimated grant date fair value |
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$ 200
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$ 200
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| Units issued in period |
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7,464
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7,993
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| 2013 Long Term Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of units granted |
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49,871
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| Vested shares, estimated fair value at grant date |
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$ 500
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| Shares paid for tax withholding for share based compensation, in shares |
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6,768
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67,141
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| Units withheld for employee tax obligation |
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$ 100
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| Units reserved for future issuance |
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23,685
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| Estimated grant date fair value |
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$ 1,700
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| Fair value of shares issued |
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$ 500
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| Annual bonus expense |
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$ 5,000
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$ 4,900
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| Common units for issued for settlement of annual bonus expenses |
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200,775
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| Phantom Share Units (PSUs) [Member] | 2013 Long Term Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of units vested |
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13,766
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26,186
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| Performance-Based Phantom Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of units granted |
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141,000
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| Number of units vested |
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37,024
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| Shares paid for tax withholding for share based compensation, in shares |
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24,605
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| Fair value of shares issued |
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$ 600
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| Units issued in period |
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74,048
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| Percentage of phantom units granted |
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200.00%
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200.00%
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| Estimated fair value of performance-based phantom units |
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$ 4,500
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$ 5,500
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| Estimated fair value of performance-based phantom units, per unit |
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$ 31.58
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$ 36.88
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$ 31.58
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| Weighted average volatility rate |
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32.90%
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26.40%
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| Weighted average risk free rate |
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0.98%
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0.43%
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| Vested units aggregate market value |
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$ 1,800
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| Unrecognized compensation cost |
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$ 3,600
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| Unrecognized compensation cost, expected recognition period |
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24 months
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| Performance-Based Phantom Units [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of phantom units granted |
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200.00%
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| Performance-Based Phantom Units [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of phantom units granted |
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0.00%
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| Restricted and Phantom Unit Award Activity [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unit-based compensation recorded in unitholders' equity |
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$ 3,000
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$ 3,600
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| Scenario, Forecast [Member] | Phantom Share Units (PSUs) [Member] | 2013 Long Term Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of units vested |
9,919
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| Scenario, Forecast [Member] | Performance-Based Phantom Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Units issued in period |
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74,048
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