Condensed Consolidating Financial Information of Guarantors and Issuers - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	$ (11.0)	$ 257.4
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(466.7)	(303.4)
Change in restricted cash	671.2	(551.0)
Payments to acquire businesses, net of transaction costs and cash acquired	(8.6)	7.7
Cash received in conjunction with the sale of a subsidiary, net of cash contributed	0	42.4
Investments in/advances to non-consolidated affiliates	(36.2)	(22.8)
Return of investment in subsidiary		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	50.4	0
Purchase of additional interests in subsidiaries	0	0
Dividends received	0
Purchases of investment securities	(26.7)	(36.0)
Proceeds from the sale and maturity of investment securities	55.8	27.0
Other	(14.1)	(6.3)
Cash flows provided by/(used in) investing activities	225.1	(842.4)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,808.1	2,469.4
Assumption of debt by non-guarantors	0	0
Debt issuance costs and fees	(57.8)	(31.9)
Borrowings under lending agreements	0	453.0
Purchase of additional interests in subsidiary	(9.9)	(9.6)
Repayments under lending agreements	0	(608.0)
Cash paid for early extinguishments of debt	(2,067.8)	(1,450.6)
Cash paid for loan maturity extension fees	(23.3)	0
Scheduled debt retirements	(9.6)	(12.7)
Dividends paid	0
Contributions from noncontrolling interest owners	35.3	0
Proceeds from sale of additional interest in a subsidiary	0	32.2
Issuance of common stock, net of fees	16.2	17.4
Other	(21.1)	(9.2)
Transfers from/(to) affiliates	0	0
Cash flows (used in)/provided by financing activities	(329.9)	850.0
Cash flows from discontinued operations
Cash flows from operating activities	0.7	29.3
Cash flows from investing activities	65.7	(2.9)
Net cash provided by discontinued operations	66.4	26.4
Net (decrease)/increase in cash and cash equivalents	(49.4)	291.4
Change in cash classified as assets held for sale	(0.2)	2.5
Cash and cash equivalents, beginning of period	1,757.5	891.2
Cash and cash equivalents, end of period	1,707.9	1,185.1
CEC (Parent Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	313.8	262.5
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	0	0
Change in restricted cash	(30.5)	0
Payments to acquire businesses, net of transaction costs and cash acquired	0	0
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Purchase of additional interests in subsidiaries	(321.8)	(127.7)
Dividends received	0
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	(0.2)	(0.6)
Cash flows provided by/(used in) investing activities	(352.5)	(128.3)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt by non-guarantors	0	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements	0	0
Purchase of additional interests in subsidiary	0	0
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	0	0
Cash paid for loan maturity extension fees	0
Scheduled debt retirements	0	0
Dividends paid	0
Contributions from noncontrolling interest owners	0
Proceeds from sale of additional interest in a subsidiary		0
Issuance of common stock, net of fees	16.2	17.4
Other	0	0
Transfers from/(to) affiliates	238.0	(136.2)
Cash flows (used in)/provided by financing activities	254.2	(118.8)
Cash flows from discontinued operations
Cash flows from operating activities	0	0
Cash flows from investing activities	0	0
Net cash provided by discontinued operations	0	0
Net (decrease)/increase in cash and cash equivalents	215.5	15.4
Change in cash classified as assets held for sale	0	0
Cash and cash equivalents, beginning of period	7.4	3.9
Cash and cash equivalents, end of period	222.9	19.3
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	(520.9)	53.8
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(7.6)	(0.7)
Change in restricted cash	0	0
Payments to acquire businesses, net of transaction costs and cash acquired	0	0
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Purchase of additional interests in subsidiaries	(15.8)	(22.8)
Dividends received	48.4
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	0	0
Cash flows provided by/(used in) investing activities	25.0	(23.5)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	127.2	110.9
Assumption of debt by non-guarantors	2,199.4	1,250.0
Debt issuance costs and fees	(49.8)	(24.7)
Borrowings under lending agreements	0	453.0
Purchase of additional interests in subsidiary	0	0
Repayments under lending agreements		(608.0)
Cash paid for early extinguishments of debt	(1,783.3)	(1,095.6)
Cash paid for loan maturity extension fees	0
Scheduled debt retirements	(8.1)	(11.3)
Dividends paid	0
Contributions from noncontrolling interest owners	0
Proceeds from sale of additional interest in a subsidiary		0
Issuance of common stock, net of fees	0	0
Other	0	0
Transfers from/(to) affiliates	(229.9)	308.8
Cash flows (used in)/provided by financing activities	255.5	383.1
Cash flows from discontinued operations
Cash flows from operating activities	0	0
Cash flows from investing activities	0	0
Net cash provided by discontinued operations	0	0
Net (decrease)/increase in cash and cash equivalents	(240.4)	413.4
Change in cash classified as assets held for sale	0	0
Cash and cash equivalents, beginning of period	911.9	16.6
Cash and cash equivalents, end of period	671.5	430.0
Subsidiary Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	160.6	(82.7)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(233.9)	(104.6)
Change in restricted cash	(1.0)	0
Payments to acquire businesses, net of transaction costs and cash acquired	0	0
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		92.5
Proceeds from partial sale of subsidiary, net of cash deconsolidated	(25.7)
Purchase of additional interests in subsidiaries	0	0
Dividends received	74.2
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	(2.4)	(8.0)
Cash flows provided by/(used in) investing activities	(188.8)	(20.1)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt by non-guarantors	0	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements	0	0
Purchase of additional interests in subsidiary	0	(9.6)
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	0	0
Cash paid for loan maturity extension fees	0
Scheduled debt retirements	(1.5)	(1.4)
Dividends paid	(48.4)
Contributions from noncontrolling interest owners	0
Proceeds from sale of additional interest in a subsidiary		0
Issuance of common stock, net of fees	0	0
Other	(6.2)	(8.2)
Transfers from/(to) affiliates	(0.1)	0.1
Cash flows (used in)/provided by financing activities	(56.2)	(19.1)
Cash flows from discontinued operations
Cash flows from operating activities	(0.5)	39.9
Cash flows from investing activities	0	(2.3)
Net cash provided by discontinued operations	(0.5)	37.6
Net (decrease)/increase in cash and cash equivalents	(84.9)	(84.3)
Change in cash classified as assets held for sale	0	1.6
Cash and cash equivalents, beginning of period	353.8	372.5
Cash and cash equivalents, end of period	268.9	289.8
Subsidiary Non-Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	34.7	14.1
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(225.2)	(198.1)
Change in restricted cash	702.7	(551.0)
Payments to acquire businesses, net of transaction costs and cash acquired	(8.6)	7.7
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		42.4
Investments in/advances to non-consolidated affiliates	(36.2)	(22.8)
Return of investment in subsidiary		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	76.1
Purchase of additional interests in subsidiaries	0	0
Dividends received	0
Purchases of investment securities	(26.7)	(36.0)
Proceeds from the sale and maturity of investment securities	55.8	27.0
Other	(11.5)	2.3
Cash flows provided by/(used in) investing activities	526.4	(728.5)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,680.9	2,358.5
Assumption of debt by non-guarantors	(2,199.4)	(1,250.0)
Debt issuance costs and fees	(8.0)	(7.2)
Borrowings under lending agreements	0	0
Purchase of additional interests in subsidiary	(9.9)	0
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	(284.5)	(355.0)
Cash paid for loan maturity extension fees	(23.3)
Scheduled debt retirements	0	0
Dividends paid	(74.2)
Contributions from noncontrolling interest owners	35.3
Proceeds from sale of additional interest in a subsidiary		32.2
Issuance of common stock, net of fees	0	0
Other	(14.9)	(1.0)
Transfers from/(to) affiliates	330.4	(114.7)
Cash flows (used in)/provided by financing activities	(567.6)	662.8
Cash flows from discontinued operations
Cash flows from operating activities	1.2	(0.9)
Cash flows from investing activities	65.7	(0.6)
Net cash provided by discontinued operations	66.9	(1.5)
Net (decrease)/increase in cash and cash equivalents	60.4	(53.1)
Change in cash classified as assets held for sale	(0.2)	0.9
Cash and cash equivalents, beginning of period	484.4	498.2
Cash and cash equivalents, end of period	544.6	446.0
Subsidiary Non-Guarantors of Parent-Only Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	195.3	(68.6)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(459.1)	(302.7)
Change in restricted cash	701.7	(551.0)
Payments to acquire businesses, net of transaction costs and cash acquired	(8.6)	7.7
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		42.4
Investments in/advances to non-consolidated affiliates	(36.2)	(22.8)
Return of investment in subsidiary		92.5
Proceeds from partial sale of subsidiary, net of cash deconsolidated	50.4
Purchase of additional interests in subsidiaries	0	0
Dividends received	74.2
Purchases of investment securities	(26.7)	(36.0)
Proceeds from the sale and maturity of investment securities	55.8	27.0
Other	(13.9)	(5.7)
Cash flows provided by/(used in) investing activities	337.6	(748.6)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,680.9	2,358.5
Assumption of debt by non-guarantors	(2,199.4)	(1,250.0)
Debt issuance costs and fees	(8.0)	(7.2)
Borrowings under lending agreements	0	0
Purchase of additional interests in subsidiary	(9.9)	(9.6)
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	(284.5)	(355.0)
Cash paid for loan maturity extension fees	(23.3)
Scheduled debt retirements	(1.5)	(1.4)
Dividends paid	(122.6)
Contributions from noncontrolling interest owners	35.3
Proceeds from sale of additional interest in a subsidiary		32.2
Issuance of common stock, net of fees	0	0
Other	(21.1)	(9.2)
Transfers from/(to) affiliates	330.3	(114.6)
Cash flows (used in)/provided by financing activities	(623.8)	643.7
Cash flows from discontinued operations
Cash flows from operating activities	0.7	39.0
Cash flows from investing activities	65.7	(2.9)
Net cash provided by discontinued operations	66.4	36.1
Net (decrease)/increase in cash and cash equivalents	(24.5)	(137.4)
Change in cash classified as assets held for sale	(0.2)	2.5
Cash and cash equivalents, beginning of period	838.2	870.7
Cash and cash equivalents, end of period	813.5	735.8
Consolidating/ Eliminating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	0.8	9.7
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	0	0
Change in restricted cash	0	0
Payments to acquire businesses, net of transaction costs and cash acquired	0	0
Cash received in conjunction with the sale of a subsidiary, net of cash contributed		0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		(92.5)
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Purchase of additional interests in subsidiaries	337.6	150.5
Dividends received	(122.6)
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	0	0
Cash flows provided by/(used in) investing activities	215.0	58.0
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt by non-guarantors	0	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements	0	0
Purchase of additional interests in subsidiary	0	0
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	0	0
Cash paid for loan maturity extension fees	0
Scheduled debt retirements	0	0
Dividends paid	122.6
Contributions from noncontrolling interest owners	0
Proceeds from sale of additional interest in a subsidiary		0
Issuance of common stock, net of fees	0	0
Other	0	0
Transfers from/(to) affiliates	(338.4)	(58.0)
Cash flows (used in)/provided by financing activities	(215.8)	(58.0)
Cash flows from discontinued operations
Cash flows from operating activities	0	(9.7)
Cash flows from investing activities	0	0
Net cash provided by discontinued operations	0	(9.7)
Net (decrease)/increase in cash and cash equivalents	0	0
Change in cash classified as assets held for sale	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0