Related Party Transactions (Details)	3 Months Ended
	Mar. 31, 2013 Fund
Related Party Transactions [Abstract]
Ownership percentage by parent in CAIJ (in hundredths)	80.00%
Ownership percentage by JIA in CAIJ (in hundredths)	20.00%
Related Party Transaction [Line Items]
Number of specific Japanese funds	2
Variable Interest Entity, Primary Beneficiary [Member]
Related Party Transaction [Line Items]
Number of specific Japanese funds	2