Stockholders' Equity - Number and Cost of Common Stock Shares Repurchased (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Common stock repurchased (in shares)	797	983
Common stock repurchased	$ 60,860	$ 51,477

This element represents the value of stock that has been repurchased during the period that is held in treasury and is presented as if constructively retired. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

No definition available.

Name:	rhi_CommonStockRepurchasedValue
Namespace Prefix:	rhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration