Contingent Consideration - Changes in Contingent Consideration Liabilities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]
Balance, beginning of period	$ 339.4	$ 340.5
Change in carrying value	8.6	17.5
Payments	(0.9)	(10.9)
Balance, end of period	347.1	347.1
Carlyle Consolidated [Member] | Performance-Based [Member] | Contingent Cash Consideration [Member]
Business Acquisition, Contingent Consideration [Line Items]
Balance, beginning of period	137.6	158.6
Change in carrying value	4.2	(7.5)
Payments		(9.3)
Balance, end of period	141.8	141.8
Carlyle Consolidated [Member] | Performance-Based [Member] | Contingent Equity Consideration [Member]
Business Acquisition, Contingent Consideration [Line Items]
Balance, beginning of period	65.7	57.6
Change in carrying value	(8.8)	(0.7)
Balance, end of period	56.9	56.9
Carlyle Consolidated [Member] | Employment-Based Contingent Cash Consideration [Member]
Business Acquisition, Contingent Consideration [Line Items]
Balance, beginning of period	106.9	96.2
Change in carrying value	11.1	21.8
Balance, end of period	118.0	118.0
Non-Carlyle Personnel [Member]
Business Acquisition, Contingent Consideration [Line Items]
Balance, beginning of period	29.2	28.1
Change in carrying value	2.1	3.9
Payments	(0.9)	(1.6)
Balance, end of period	$ 30.4	$ 30.4