Quarterly report pursuant to sections 13 or 15(d)

Notes Receivable from Partners - Schedule of Notes Receivable from Partners (Detail)

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Notes Receivable from Partners - Schedule of Notes Receivable from Partners (Detail) (Partners [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Partners [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 3,410 $ 6,024
Repayment of notes (887) (2,864)
Interest accrued and capitalized on notes receivable 45 138
New notes receivable issued to partners 455 112
Ending balance $ 3,023 $ 3,410