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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Additional paid-in-capital $ 74,802   $ 73,829
Retained earnings $ 8,685   4,549
Expected contract length 10 years    
Contract asset related to the cost to obtain contracts $ 999    
Contract asset amortization expense 122    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Additional paid-in-capital   $ 411  
Retained earnings   20  
Hamilton Lane Advisors, L.L.C.      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Non-controlling interest $ 54,681   $ 50,382
Hamilton Lane Advisors, L.L.C. | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Non-controlling interest   $ 566  
Separate Accounts and Specialized Funds Concentration Risk | Profits | Minimum      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Incentive fee revenue as a percent of total profit 6.00%    
Separate Accounts and Specialized Funds Concentration Risk | Profits | Maximum      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Incentive fee revenue as a percent of total profit 12.50%    
Incentive fees      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Previously deferred incentive fees recognized during the period $ 2,541