Quarterly report pursuant to Section 13 or 15(d)

Merger and Acquisition Activity - Additional Information (Detail)

v3.21.2
Merger and Acquisition Activity - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition, Contingent Consideration [Line Items]      
Maximum contingent consideration obligation $ 99,800   $ 102,400
Ryan Re [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired   53.00%  
Impairments of acquired goodwill and other intangible assets $ 0