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Long-Term Debt - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 2 Months Ended 1 Months Ended 6 Months Ended 5 Months Ended 6 Months Ended 5 Months Ended 5 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Apr. 04, 2012
$370,000 Credit Facility (i)
Feb. 15, 2012
$370,000 Credit Facility (i)
Jun. 30, 2013
$370,000 Credit Facility (i)
May 23, 2012
$350,000 Credit Facility (ii)
Jun. 30, 2013
$350,000 Credit Facility (ii)
May 23, 2012
$25,000 Credit Facility (iii)
Jun. 30, 2013
$25,000 Credit Facility (iii)
May 23, 2012
All three Credit Facilities
May 23, 2012
$370,000 Term Loan
Jun. 06, 2012
Repayment Of Debt
Jun. 30, 2013
Long-Term Debt
Jun. 30, 2012
Long-Term Debt
Debt Instrument [Line Items]                            
Repayment of credit facility $ 1,350 $ 170,066 $ 10,500 $ 10,000     $ 5,149     $ 149,566   $ 13,141    
Balloon payment due in March 2018             27,000              
Line of credit facility, maximum borrowing capacity         370,000   350,000   25,000          
Line of credit facility amount drawn down             54,000              
Repayment of debt - Net proceeds from issuance of preferred units 72,535 136,425                   136,425    
Debt's original amount         370,000                  
Cancellation of undrawn tranche           52,500 1,420              
Number of installments           9 20 9     6      
Quarterly periodic repayments           7,855 1,350 1,000     12,975      
Weighted average interest rate                         2.71%  
Interest expense on long term debt $ 7,357 $ 18,929                     $ 7,077 $ 18,379