Condensed Consolidating Financial Information of Guarantors and Issuers - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ (57.0)	$ 71.5
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(320.3)	(192.0)
Change in restricted cash	863.8	100.7
Payments to acquire businesses, net of transaction costs and cash acquired	0	15.2
Proceeds from partial sale of subsidiary, net of cash deconsolidated	50.4	0
Investments in/advances to non-consolidated affiliates	(27.8)	(13.9)
Return of investment in subsidiary		0
Purchase of additional interests in subsidiaries	0	0
Dividends received	0
Purchases of investment securities	(1.7)	(18.9)
Proceeds from the sale and maturity of investment securities	16.1	12.9
Other	(7.0)	(4.2)
Cash flows provided by/(used in) investing activities	573.5	(100.2)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,589.5	1,710.1
Assumption of debt issued by non-guarantors	0
Debt issuance costs and fees	(47.3)	(31.9)
Borrowings under lending agreements	0	453.0
Repayments under lending agreements	0	(608.0)
Cash paid for early extinguishments of debt	(2,010.3)	(1,450.6)
Cash paid for loan maturity extension fees	(23.3)	0
Scheduled debt retirements	(7.1)	(9.0)
Dividends paid	0
Contributions from non controlling interest owners	35.3	0
Purchase of additional interests in subsidiary	0	(9.6)
Non-controlling interest distributions, net of contributions	0	32.2
Issuance of common stock, net of fees	12.6	17.4
Other	(13.0)	(11.1)
Transfers from/(to) affiliates	0	0
Cash flows (used in)/provided by financing activities	(463.6)	92.5
Cash flows from discontinued operations
Cash flows from operating activities	0.4	27.8
Cash flows from investing activities	0	(2.5)
Net cash provided by discontinued operations	0.4	25.3
Net increase in cash and cash equivalents	53.3	89.1
Change in cash classified as assets held for sale	(0.1)	0.9
Cash and cash equivalents, beginning of period	1,757.5	891.2
Cash and cash equivalents, end of period	1,810.7	981.2
CEC (Parent Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	215.2	175.5
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	0	0
Change in restricted cash	(10.5)	0
Payments to acquire businesses, net of transaction costs and cash acquired		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		0
Purchase of additional interests in subsidiaries	(267.5)	(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)	(0.8)
Cash flows provided by/(used in) investing activities	(278.2)	(128.5)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt issued by non-guarantors	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements		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 non controlling interest owners	0
Purchase of additional interests in subsidiary		0
Non-controlling interest distributions, net of contributions		0
Issuance of common stock, net of fees	12.6	17.4
Other	0	0
Transfers from/(to) affiliates	238.0	(60.3)
Cash flows (used in)/provided by financing activities	250.6	(42.9)
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 increase in cash and cash equivalents	187.6	4.1
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	195.0	8.0
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(492.7)	(137.9)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(3.9)	(3.0)
Change in restricted cash	0	0
Payments to acquire businesses, net of transaction costs and cash acquired		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		0
Purchase of additional interests in subsidiaries	(7.4)	(13.9)
Dividends received	48.4
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	(0.1)	0
Cash flows provided by/(used in) investing activities	37.0	(16.9)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	127.0	1,351.6
Assumption of debt issued by non-guarantors	2,199.4
Debt issuance costs and fees	(47.3)	(24.7)
Borrowings under lending agreements		453.0
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	(5.6)	(7.6)
Dividends paid	0
Contributions from non controlling interest owners	0
Purchase of additional interests in subsidiary		0
Non-controlling interest distributions, net of contributions		0
Issuance of common stock, net of fees	0	0
Other	0	0
Transfers from/(to) affiliates	(215.3)	176.3
Cash flows (used in)/provided by financing activities	274.9	245.0
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 increase in cash and cash equivalents	(180.8)	90.2
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	731.1	106.8
Subsidiary Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	120.3	(99.7)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(159.9)	(66.0)
Change in restricted cash	(1.0)	0
Payments to acquire businesses, net of transaction costs and cash acquired		0
Proceeds from partial sale of subsidiary, net of cash deconsolidated	(25.7)
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		92.5
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)	(5.6)
Cash flows provided by/(used in) investing activities	(114.8)	20.9
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt issued by non-guarantors	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements		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	(1.5)	(1.4)
Dividends paid	(48.4)
Contributions from non controlling interest owners	0
Purchase of additional interests in subsidiary		(9.6)
Non-controlling interest distributions, net of contributions		0
Issuance of common stock, net of fees	0	0
Other	(4.2)	(7.3)
Transfers from/(to) affiliates	(0.2)	0.1
Cash flows (used in)/provided by financing activities	(54.3)	(18.2)
Cash flows from discontinued operations
Cash flows from operating activities	(0.4)	28.6
Cash flows from investing activities	0	(2.3)
Net cash provided by discontinued operations	(0.4)	26.3
Net increase in cash and cash equivalents	(49.2)	(70.7)
Change in cash classified as assets held for sale	0	0.4
Cash and cash equivalents, beginning of period	353.8	372.5
Cash and cash equivalents, end of period	304.6	302.2
Subsidiary Non-Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	99.4	133.6
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(156.5)	(123.0)
Change in restricted cash	875.3	100.7
Payments to acquire businesses, net of transaction costs and cash acquired		15.2
Proceeds from partial sale of subsidiary, net of cash deconsolidated	76.1
Investments in/advances to non-consolidated affiliates	(27.8)	(13.9)
Return of investment in subsidiary		0
Purchase of additional interests in subsidiaries	0	0
Dividends received	0
Purchases of investment securities	(1.7)	(18.9)
Proceeds from the sale and maturity of investment securities	16.1	12.9
Other	(4.3)	2.2
Cash flows provided by/(used in) investing activities	777.2	(24.8)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,462.5	358.5
Assumption of debt issued by non-guarantors	(2,199.4)
Debt issuance costs and fees	0	(7.2)
Borrowings under lending agreements		0
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	(227.0)	(355.0)
Cash paid for loan maturity extension fees	(23.3)
Scheduled debt retirements	0	0
Dividends paid	(74.2)
Contributions from non controlling interest owners	35.3
Purchase of additional interests in subsidiary		0
Non-controlling interest distributions, net of contributions		32.2
Issuance of common stock, net of fees	0	0
Other	(8.8)	(3.8)
Transfers from/(to) affiliates	253.2	(67.0)
Cash flows (used in)/provided by financing activities	(781.7)	(42.3)
Cash flows from discontinued operations
Cash flows from operating activities	0.8	(0.8)
Cash flows from investing activities	0	(0.2)
Net cash provided by discontinued operations	0.8	(1.0)
Net increase in cash and cash equivalents	95.7	65.5
Change in cash classified as assets held for sale	(0.1)	0.5
Cash and cash equivalents, beginning of period	484.4	498.2
Cash and cash equivalents, end of period	580.0	564.2
Subsidiary Non-Guarantors of Parent-Only Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	219.7	33.9
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(316.4)	(189.0)
Change in restricted cash	874.3	100.7
Payments to acquire businesses, net of transaction costs and cash acquired		15.2
Proceeds from partial sale of subsidiary, net of cash deconsolidated	50.4
Investments in/advances to non-consolidated affiliates	(27.8)	(13.9)
Return of investment in subsidiary		92.5
Purchase of additional interests in subsidiaries	0	0
Dividends received	74.2
Purchases of investment securities	(1.7)	(18.9)
Proceeds from the sale and maturity of investment securities	16.1	12.9
Other	(6.7)	(3.4)
Cash flows provided by/(used in) investing activities	662.4	(3.9)
Cash flows from financing activities
Proceeds from the issuance of long-term debt	1,462.5	358.5
Assumption of debt issued by non-guarantors	(2,199.4)
Debt issuance costs and fees	0	(7.2)
Borrowings under lending agreements		0
Repayments under lending agreements		0
Cash paid for early extinguishments of debt	(227.0)	(355.0)
Cash paid for loan maturity extension fees	(23.3)
Scheduled debt retirements	(1.5)	(1.4)
Dividends paid	(122.6)
Contributions from non controlling interest owners	35.3
Purchase of additional interests in subsidiary		(9.6)
Non-controlling interest distributions, net of contributions		32.2
Issuance of common stock, net of fees	0	0
Other	(13.0)	(11.1)
Transfers from/(to) affiliates	253.0	(66.9)
Cash flows (used in)/provided by financing activities	(836.0)	(60.5)
Cash flows from discontinued operations
Cash flows from operating activities	0.4	27.8
Cash flows from investing activities	0	(2.5)
Net cash provided by discontinued operations	0.4	25.3
Net increase in cash and cash equivalents	46.5	(5.2)
Change in cash classified as assets held for sale	(0.1)	0.9
Cash and cash equivalents, beginning of period	838.2	870.7
Cash and cash equivalents, end of period	884.6	866.4
Consolidating/ Eliminating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0.8	0
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
Proceeds from partial sale of subsidiary, net of cash deconsolidated	0
Investments in/advances to non-consolidated affiliates	0	0
Return of investment in subsidiary		(92.5)
Purchase of additional interests in subsidiaries	274.9	141.6
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	152.3	49.1
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	0
Assumption of debt issued by non-guarantors	0
Debt issuance costs and fees	0	0
Borrowings under lending agreements		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 non controlling interest owners	0
Purchase of additional interests in subsidiary		0
Non-controlling interest distributions, net of contributions		0
Issuance of common stock, net of fees	0	0
Other	0	0
Transfers from/(to) affiliates	(275.7)	(49.1)
Cash flows (used in)/provided by financing activities	(153.1)	(49.1)
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 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