Ryan Specialty Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Company's Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Inputs, Level 1 [Member]
Liabilities:
Debt	$ 1,637,584	$ 1,648,997
Total liabilities measured at fair value	1,637,584	1,648,997
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Contingent purchase consideration	19,383	22,096
Total liabilities measured at fair value	19,383	52,519	$ 25,827	$ 24,418
Fair Value, Inputs, Level 3 [Member] \| Redeemable Preferred Units [Member]
Liabilities:
Make-whole provision on Redeemable Preferred Units	$ 0	$ 30,423