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Total Capital and Net Income Per Common Unit - Additional Information - Series D Preferred Units and Detachable Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Limited Partners' Capital Account [Line Items]        
Proceeds from issuance or sale of equity $ 100,000      
Proceeds from issuance or sale of equity, net of offering costs 97,200      
Stock issuance costs $ 2,800 $ 5,601 $ 4,187  
Warrants outstanding   6,750,000   0
The Warrants [Member]        
Limited Partners' Capital Account [Line Items]        
Warrants, term 7 years      
Period after which warrants are exercisable 6 months      
The $4.55 Warrants [Member]        
Limited Partners' Capital Account [Line Items]        
Exercise price of warrants $ 4.55      
Proceeds from issuance or sale of equity, net of offering costs $ 9,500      
Warrants outstanding 4,500,000      
The $6.05 Warrants [Member]        
Limited Partners' Capital Account [Line Items]        
Exercise price of warrants $ 6.05      
Exercise premium 33.00%      
Proceeds from issuance or sale of equity, net of offering costs $ 4,300      
Warrants outstanding 2,250,000      
Series D Preferred Stock [Member]        
Limited Partners' Capital Account [Line Items]        
Proceeds from equity offerings, net of offering costs (note 12), units 4,000,000      
Preferred units dividend rate 10.50%      
Proceeds from issuance or sale of equity, net of offering costs $ 83,500      
Dividend payment terms, discount on 10 days trading volume weighted average price, percent 4.00%      
Liquidation preference per share $ 25.00      
Redemption period one 5 years      
Premium to liquidation value in redemption period one, percent 10.00%      
Premium to liquidation value in redemption period two, percent 5.00%      
Redemption period two 6 years      
Redemption price per share $ 4.00      
Percent of common units purchased to trigger a change of control event 90.00%      
Change of control premium to liquidation preference in year one, percent 25.00%      
Annual decrease to change of control premium to liquidation preference, percent 5.00%      
Change of control premium to liquidation preference in year five and thereafter, percent 5.00%      
Preferred stock redemption discount $ 16,500      
Redemption period 5 years