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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value Option Quantitative Disclosures [Line Items]          
Transfers into or out of Level 3 in the fair value measurement hierarchy $ 0 $ 0 $ 0 $ 0  
Unfunded Commitments 5,560,000   5,560,000   $ 5,597,000
EGCP III [Member]          
Fair Value Option Quantitative Disclosures [Line Items]          
Unfunded Commitments $ 5,158,000   $ 5,158,000    
End of the investment period     Oct. 12, 2016    
Remaining obligation date     Oct. 12, 2023