Fair Value Measurements - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Dec. 31, 2016 |
|
Fair Value Option Quantitative Disclosures [Line Items] | |||||
Transfers between Level 1, 2 and 3 in fair value measurement hierarchy | $ 0 | $ 0 | $ 0 | $ 0 | |
Unfunded Commitments | 9,183,000 | 9,183,000 | $ 9,183,000 | ||
EGCP III [Member] | |||||
Fair Value Option Quantitative Disclosures [Line Items] | |||||
Unfunded Commitments | $ 8,613,000 | $ 8,613,000 | |||
End of the investment period | Oct. 12, 2016 | ||||
Remaining obligation date | Oct. 12, 2023 |