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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Related Party Transactions [Abstract] |  |
Repurchase interests of partners and trust unit holders | $ 233 | $ 14

X
- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + References No definition available. + Details
Name: | us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration