Market and Credit Risk - Narrative (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Number of limited partners	1,000
Total committed capital by individual investor no more than	10.00%
Variable Interest Rate
Concentration Risk [Line Items]
Debt balance	$ 750.0	$ 750.0