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Partners' Capital, Equity and Incentive Compensation Plans - Summary of Award Activity Under 2010 Equity Incentive Plan and 2013 Equity Incentive Plan and Related Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
2013 Equity Incentive Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Weighted average fair value $ 3.50
Weighted average fair value, Granted $ 4.94
Weighted average fair value, Exercised   
Weighted average fair value, Released from restriction   
Weighted average fair value, Cancelled/Expired $ 3.52
Ending balance, Weighted average fair value $ 4.12
Beginning balance, Options Outstanding 367,910
Options, Granted 230,539
Options, Exercised 0
Options, Released from restriction 0
Options, Cancelled/Expired (5,000)
Ending balance, Options Outstanding 593,449
Beginning balance, Weighted average exercise price options outstanding $ 21.00
Weighted average exercise price options outstanding, Granted $ 25.51
Weighted average exercise price options outstanding, Exercised $ 0
Weighted average exercise price options outstanding, Released from restriction $ 0
Weighted average exercise price options outstanding, Cancelled/Expired $ 21.00
Ending balance, Weighted average exercise price options outstanding $ 22.75
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units 108,629
Number of units, Granted 44,000
Number of units, Exercised 0
Number of units, Released from restriction 0
Number of units, Cancelled/Expired 0
Ending balance, Number of units 152,629
Beginning balance, Weighted average exercise price units $ 21.00
Weighted average exercise price units, Granted $ 25.51
Weighted average exercise price units, Exercised   
Weighted average exercise price units, Released from restriction   
Weighted average exercise price units, Cancelled/Expired   
Ending balance, Weighted average exercise price units $ 22.30
2010 Equity Incentive Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Weighted average fair value $ 3.84
Weighted average fair value, Granted   
Weighted average fair value, Exercised   
Weighted average fair value, Released from restriction   
Weighted average fair value, Cancelled/Expired $ 7.93
Ending balance, Weighted average fair value $ 4.09
2010 Equity Incentive Plan [Member] | Class O Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units 1,622,747
Number of units, Granted 0
Number of units, Exercised 0
Number of units, Released from restriction 0
Number of units, Cancelled/Expired (34,395)
Ending balance, Number of units 1,588,352
Beginning balance, Weighted average exercise price units $ 23.44
Weighted average exercise price units, Granted   
Weighted average exercise price units, Exercised   
Weighted average exercise price units, Released from restriction   
Weighted average exercise price units, Cancelled/Expired $ 24.83
Ending balance, Weighted average exercise price units $ 24.49
2010 Equity Incentive Plan [Member] | Class RS Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units 173,750
Number of units, Granted 0
Number of units, Exercised 0
Number of units, Released from restriction (81,750)
Number of units, Cancelled/Expired 0
Ending balance, Number of units 92,000
Beginning balance, Weighted average exercise price units $ 21.86
Weighted average exercise price units, Granted   
Weighted average exercise price units, Exercised   
Weighted average exercise price units, Released from restriction $ 25.00
Weighted average exercise price units, Cancelled/Expired   
Ending balance, Weighted average exercise price units $ 23.78