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2. SUMMARY OF ACCOUNTING POLICIES (Details - Investment in Joint Ventures) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]
Beginning balance, as of January 1, 2014				$ 28,949					$ 28,949
Purchase of a 49% interest in a new joint venture									2,168rdnt_PurchaseInterestJointVenture
Equity contributions in existing joint ventures									1,394rdnt_EquityContributionsJointVentures
Equity earnings in these joint ventures	2,248	2,009	1,646	1,067	1,713	1,617	1,658	1,206	6,970	6,194	6,476
Distribution of earnings									(7,358)	(7,204)	(6,477)
Ending balance, as of December 31, 2014	$ 32,123				$ 28,949				$ 32,123	$ 28,949

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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