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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transactions [Abstract]    
Repurchase interests of partners and trust unit holders $ 1us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest $ 48us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest