Quarterly report pursuant to Section 13 or 15(d)

Defined Contribution and Deferred Compensation Plans - Additional Information (Detail)

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Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contributions towards benefit of employees $ 19 $ 16 $ 54 $ 49
Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contribution percentage     4.00%