Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Rollforward Analysis of the Allowance Against the Partner Accounts Receivable Balance (Detail)

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Summary of Significant Accounting Policies - Rollforward Analysis of the Allowance Against the Partner Accounts Receivable Balance (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Rollforward analysis of the allowance against the partner accounts receivable    
Allowance for doubtful accounts, Beginning Balance $ (6,069) $ (4,448)
Allowance for doubtful accounts, Charged to Costs and Expenses (1,562) (1,621)
Allowance for doubtful accounts, Ending Balance $ (7,631) $ (6,069)