Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 CP II [Member]	Jun. 30, 2014 EGCP III [Member]	Jun. 30, 2014 COF2 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Transfers between Level 1 , 2 and 3 in fair value measurement hierarchy	$ 0	$ 0
Unfunded Commitments	$ 26,441		$ 27,135	$ 1,782	$ 17,686	$ 6,973
End of the investment period				Feb. 25, 2017	Oct. 12, 2016	Nov. 11, 2016
Remaining commitments date					Oct. 12, 2023	Nov. 11, 2019