Unit-Based Compensation (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 07, 2014	Oct. 07, 2014	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Unit-Based Compensation
Limited Partners' Capital Account, Units Authorized			22,119,170	22,119,170
Service condition
Unit-Based Compensation
Vesting period					3 years
Class B Common Unit | Performance condition
Units
Granted (in units)					75,000
Common Stock Unissued				25,000
Unit Based Compensation Expense Reversal | $				$ 297
Class B Common Unit | Performance condition | Maximum
Unit-Based Compensation
Limited Partners' Capital Account, Units Authorized			100,000
Prior to the closing of the IPO | Existing Common Units
Additional information
Unit split ratio	0.89	0.89
Percentage of ownership interest in partnership	19.70%	19.70%
Prior to the closing of the IPO | Subordinated
Additional information
Percentage of ownership interest in partnership	80.30%	80.30%
Phantom Units
Unit-Based Compensation
Limited Partners' Capital Account, Units Authorized					3,642,700
Units
Outstanding at the beginning of the period (in units)			392,420
Granted (in units)			362,743	497,479
Vested (in units)			(96,513)	(8,250)
Forfeited (in units)			(117,116)	(96,809)
Outstanding at the end of the period (in units)			541,534	392,420
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per unit) | $ / shares			$ 12.99
Granted (in dollars per unit) | $ / shares			5.33	$ 12.84
Vested (in dollars per unit) | $ / shares			11.27	12.90
Forfeited (in dollars per unit) | $ / shares			10.81	12.26
Outstanding at the end of the period (in dollars per unit) | $ / shares			$ 8.64	$ 12.99
Additional information
Compensation expense expected to be recognized (in dollars) | $			$ 2,600
Weighted average period for expected recognition of compensation expense			1 year 4 months 24 days
Equity based compensation expense (in dollars) | $			$ 1,691	$ 849
Estimated forfeiture rate (as a percent)			32.00%
Restricted Common Units of JPE | Common
Units
Outstanding at the beginning of the period (in units)			6,424	31,012
Vested (in units)			(2,920)
Outstanding at the end of the period (in units)			3,504	6,424	31,012
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per unit) | $ / shares			$ 25.91	$ 24.36
Vested (in dollars per unit) | $ / shares			29.46
Outstanding at the end of the period (in dollars per unit) | $ / shares			$ 22.95	$ 25.91	$ 24.36
Restricted Common Units of JPE | Subordinated
Units
Outstanding at the beginning of the period (in units)			26,216	126,553
Vested (in units)			(11,916)
Outstanding at the end of the period (in units)			14,300	26,216	126,553
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per unit) | $ / shares			$ 25.91	$ 24.36
Vested (in dollars per unit) | $ / shares			29.46
Outstanding at the end of the period (in dollars per unit) | $ / shares			$ 22.95	$ 25.91	$ 24.36
Restricted Common Units of JPE | Service condition | Common
Units
Vested (in units)				(10,512)	(876)
Forfeited (in units)				(14,076)	(2,715)
Weighted Average Grant Date Fair Value
Vested (in dollars per unit) | $ / shares				$ 25.37	$ 36.75
Forfeited (in dollars per unit) | $ / shares				$ 22.89	$ 39.22
Restricted Common Units of JPE | Service condition | Subordinated
Units
Vested (in units)				(42,898)	(3,576)
Forfeited (in units)				(57,439)	(11,082)
Weighted Average Grant Date Fair Value
Vested (in dollars per unit) | $ / shares				$ 25.37	$ 36.75
Forfeited (in dollars per unit) | $ / shares				$ 22.89	$ 39.22
Restricted Common Units of JPE | Class B Common Unit
Units
Outstanding at the beginning of the period (in units)					177,867
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per unit) | $ / shares					$ 25.58
Additional information
Compensation expense expected to be recognized (in dollars) | $			$ 228
Weighted average period for expected recognition of compensation expense			1 year 11 days
Equity based compensation expense (in dollars) | $			$ 333	$ 460	$ 1,789
Ratio of distributions to per unit distributions paid to common units			1
Restricted Common Units of JPE | Class B Common Unit | Service condition
Units
Granted (in units)					90,000
Vested (in units)					(63,698)
Forfeited (in units)					(6,667)
Weighted Average Grant Date Fair Value
Granted (in dollars per unit) | $ / shares					$ 19.64
Vested (in dollars per unit) | $ / shares					24.21
Forfeited (in dollars per unit) | $ / shares					$ 34.91
Restricted Common Units of JPE | Class B Common Unit | Service condition | Minimum
Unit-Based Compensation
Vesting period			3 years
Restricted Common Units of JPE | Class B Common Unit | Service condition | Maximum
Unit-Based Compensation
Vesting period			5 years
Restricted Common Units of JPE | IPO | Common
Units
Conversion upon IPO					34,603
Weighted Average Grant Date Fair Value
Conversion upon IPO | $ / shares					$ 25.84
Restricted Common Units of JPE | IPO | Subordinated
Units
Conversion upon IPO					(141,211)
Weighted Average Grant Date Fair Value
Conversion upon IPO | $ / shares					$ 25.84
Restricted Common Units of JPE | IPO | Class B Common Unit
Units
Conversion upon IPO					(197,502)
Weighted Average Grant Date Fair Value
Conversion upon IPO | $ / shares					$ 23.00