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)

v2.4.1.9
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, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Allowance for Bad Debt, Beginning Balance $ (7,631)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (6,069)us-gaap_AllowanceForDoubtfulAccountsReceivable  
Allowance for Bad Debt, Charged to Costs and Expenses (2,400)us-gaap_ProvisionForDoubtfulAccounts (1,562)us-gaap_ProvisionForDoubtfulAccounts (1,621)us-gaap_ProvisionForDoubtfulAccounts
Allowance for Bad Debt, Ending Balance $ (10,031)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (7,631)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (6,069)us-gaap_AllowanceForDoubtfulAccountsReceivable