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Derivative Instruments - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 5 Months Ended 6 Months Ended
Mar. 31, 2012
May 23, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2012
$370,000 Credit Facility
Jun. 29, 2012
$370,000 Credit Facility
Jun. 30, 2013
$350,000 Credit Facility
Debt Instrument [Line Items]              
Number of Interest rate swaps     14        
Number of Partnership's interest rate swaps expired     3     9  
Number of interest rate swap agreements terminated         1   1
Number of interest rate swap agreements partially terminated             1
Amount of interest rate derivatives expired     $ 59,084        
Interest rate swap agreements base rate     LIBOR        
Number of interest rate swaps not qualifying as cash flow hedges 1 1          
Interest rate swap not qualifying as cashflow hedge, amount to be amortized from OCL to Partnership' s Consolidated Statements of Comprehensive Loss 1,400 50          
Amortization of gain/loss included in Accumulated OCI due to ineffectiveness     363 362      
Change of the fair value of certain swap agreements     $ 4 $ 1,447