Condensed Consolidating Financial Information of Guarantors and Issuers - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ (93.8)	$ (47.3)	$ 109.4
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(240.5)	(148.1)
Change in restricted cash	94.4	831.7
Payments to acquire businesses, net of transaction costs and cash acquired	(22.5)	0
Investments in/advances to non-consolidated affiliates and other	(2.1)	(21.9)
Proceeds received from sale of assets	12.5	0
Purchase of additional interests in subsidiaries		0
Dividends received		0
Purchases of investment securities	(12.5)	(1.4)
Proceeds from the sale and maturity of investment securities	3.9	0.7
Other	2.9	(3.2)
Cash flows from investing activities	(163.9)	657.8
Cash flows from financing activities
Proceeds from the issuance of long-term debt	0	1,589.5
Assumption of debt by non-guarantors		0
Debt issuance and extension costs and fees	(8.0)	(70.6)
Borrowings under lending agreements	0
Repayments under lending agreements	0
Repayments of Other Long-term Debt	(15.9)	(5.6)
Payments to Acquire Interest in Subsidiaries and Affiliates	4.0	0
Cash paid for early extinguishments of debt	(9.7)	(1,784.2)
Dividends paid		0
Contributions from noncontrolling interest owners	11.7	0
Distributions to noncontrolling interest owners	(4.4)	0
Proceeds from issuance of common stock	0.90	0
Other	0	(2.7)
Transfers from/(to) affiliates	0	0
Cash flows from financing activities	(29.4)	(273.6)
Cash flows from discontinued operations
Cash flows from operating activities	(0.7)	1.1
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	(0.7)	1.1
Net increase/(decrease) in cash and cash equivalents	(287.8)	338.0
Increase (Decrease) in Assets Held-for-sale		(0.1)
Cash and cash equivalents, beginning of period	2,771.2	1,757.5	1,757.5
Cash and cash equivalents, end of period	2,483.4	2,095.4	2,771.2
CEC (Parent Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(18.9)	56.0
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
Investments in/advances to non-consolidated affiliates and other	0	0
Proceeds received from sale of assets	0
Purchase of additional interests in subsidiaries		(20.4)
Dividends received		0
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	1.1	(0.2)
Cash flows from investing activities	1.1	(20.6)
Cash flows from financing activities
Proceeds from the issuance of long-term debt		0
Assumption of debt by non-guarantors		0
Debt issuance and extension costs and fees	0	0
Borrowings under lending agreements	0
Repayments under lending agreements	0
Repayments of Other Long-term Debt	(0.2)	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Cash paid for early extinguishments of debt	0	0
Dividends paid		0
Contributions from noncontrolling interest owners	0
Distributions to noncontrolling interest owners	0
Proceeds from issuance of common stock	0.90
Other	0	0
Transfers from/(to) affiliates	24.3	38.0
Cash flows from financing activities	25.0	38.0
Cash flows from discontinued operations
Cash flows from operating activities	0	0
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	0	0
Net increase/(decrease) in cash and cash equivalents	7.2	73.4
Increase (Decrease) in Assets Held-for-sale		0
Cash and cash equivalents, beginning of period	113.3	7.4	7.4
Cash and cash equivalents, end of period	120.5	80.8
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(195.0)	(121.0)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(6.0)	(2.1)
Change in restricted cash	0	0
Payments to acquire businesses, net of transaction costs and cash acquired	0
Investments in/advances to non-consolidated affiliates and other	0	0
Proceeds received from sale of assets	0
Purchase of additional interests in subsidiaries		(1.5)
Dividends received		18.6
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	0	0
Cash flows from investing activities	(6.0)	15.0
Cash flows from financing activities
Proceeds from the issuance of long-term debt		127.0
Assumption of debt by non-guarantors		2,199.4
Debt issuance and extension costs and fees	(0.8)	(47.3)
Borrowings under lending agreements	(6.2)
Repayments under lending agreements	13.0
Repayments of Other Long-term Debt	(2.7)	(2.5)
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Cash paid for early extinguishments of debt	0	(1,783.3)
Dividends paid		0
Contributions from noncontrolling interest owners	0
Distributions to noncontrolling interest owners	0
Proceeds from issuance of common stock	0
Other	0	0
Transfers from/(to) affiliates	(24.9)	(15.3)
Cash flows from financing activities	(21.6)	478.0
Cash flows from discontinued operations
Cash flows from operating activities	0	0
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	0	0
Net increase/(decrease) in cash and cash equivalents	(222.6)	372.0
Increase (Decrease) in Assets Held-for-sale		0
Cash and cash equivalents, beginning of period	996.4	911.9	911.9
Cash and cash equivalents, end of period	773.8	1,283.9
Subsidiary Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	45.1	31.4
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(82.3)	(76.4)
Change in restricted cash	0	(5.1)
Payments to acquire businesses, net of transaction costs and cash acquired	0
Investments in/advances to non-consolidated affiliates and other	0	0
Proceeds received from sale of assets	12.5
Purchase of additional interests in subsidiaries		0
Dividends received		18.6
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	1.8	(2.0)
Cash flows from investing activities	(68.0)	(64.9)
Cash flows from financing activities
Proceeds from the issuance of long-term debt		0
Assumption of debt by non-guarantors		0
Debt issuance and extension costs and fees	0	0
Borrowings under lending agreements	0
Repayments under lending agreements	0
Repayments of Other Long-term Debt	(3.8)	(1.7)
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Cash paid for early extinguishments of debt	0	0
Dividends paid		(18.6)
Contributions from noncontrolling interest owners	0
Distributions to noncontrolling interest owners	0
Proceeds from issuance of common stock	0
Other	0	0
Transfers from/(to) affiliates	(1.1)	(0.1)
Cash flows from financing activities	(4.9)	(20.4)
Cash flows from discontinued operations
Cash flows from operating activities	0	(0.4)
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	0	(0.4)
Net increase/(decrease) in cash and cash equivalents	(27.8)	(54.3)
Increase (Decrease) in Assets Held-for-sale		0
Cash and cash equivalents, beginning of period	293.6	353.8	353.8
Cash and cash equivalents, end of period	265.8	299.5
Subsidiary Non-Guarantors of Parent and Subsidiary Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	76.5	(9.9)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(152.2)	(73.4)
Change in restricted cash	94.4	836.8
Payments to acquire businesses, net of transaction costs and cash acquired	(22.5)
Investments in/advances to non-consolidated affiliates and other	(2.1)	(21.9)
Proceeds received from sale of assets	0
Purchase of additional interests in subsidiaries		0
Dividends received		0
Purchases of investment securities	(12.5)	(1.4)
Proceeds from the sale and maturity of investment securities	3.9	0.7
Other	0	(1.0)
Cash flows from investing activities	(91.0)	739.8
Cash flows from financing activities
Proceeds from the issuance of long-term debt		1,462.5
Assumption of debt by non-guarantors		(2,199.4)
Debt issuance and extension costs and fees	(7.2)	(23.3)
Borrowings under lending agreements	6.2
Repayments under lending agreements	(13.0)
Repayments of Other Long-term Debt	(9.2)	(1.4)
Payments to Acquire Interest in Subsidiaries and Affiliates	4.0
Cash paid for early extinguishments of debt	(9.7)	(0.9)
Dividends paid		(18.6)
Contributions from noncontrolling interest owners	11.7
Distributions to noncontrolling interest owners	(4.4)
Proceeds from issuance of common stock	0
Other	0.2	(2.7)
Transfers from/(to) affiliates	0	(0.7)
Cash flows from financing activities	(29.4)	(784.5)
Cash flows from discontinued operations
Cash flows from operating activities	(0.7)	1.5
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	(0.7)	1.5
Net increase/(decrease) in cash and cash equivalents	(44.6)	(53.1)
Increase (Decrease) in Assets Held-for-sale		(0.1)
Cash and cash equivalents, beginning of period	1,367.9	484.4	484.4
Cash and cash equivalents, end of period	1,323.3	431.2
Subsidiary Non-Guarantors of Parent-Only Guaranteed Debt [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	121.6	21.5
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	(234.5)	(149.8)
Change in restricted cash	94.4	831.7
Payments to acquire businesses, net of transaction costs and cash acquired	(22.5)
Investments in/advances to non-consolidated affiliates and other	(2.1)	(21.9)
Proceeds received from sale of assets	12.5
Purchase of additional interests in subsidiaries		0
Dividends received		18.6
Purchases of investment securities	(12.5)	(1.4)
Proceeds from the sale and maturity of investment securities	3.9	0.7
Other	1.8	(3.0)
Cash flows from investing activities	(159.0)	674.9
Cash flows from financing activities
Proceeds from the issuance of long-term debt		1,462.5
Assumption of debt by non-guarantors		(2,199.4)
Debt issuance and extension costs and fees	(7.2)	(23.3)
Borrowings under lending agreements	6.2
Repayments under lending agreements	(13.0)
Repayments of Other Long-term Debt	(13.0)	(3.1)
Payments to Acquire Interest in Subsidiaries and Affiliates	4.0
Cash paid for early extinguishments of debt	(9.7)	(0.9)
Dividends paid		(37.2)
Contributions from noncontrolling interest owners	11.7
Distributions to noncontrolling interest owners	(4.4)
Proceeds from issuance of common stock	0
Other	0.2	(2.7)
Transfers from/(to) affiliates	(1.1)	(0.8)
Cash flows from financing activities	(34.3)	(804.9)
Cash flows from discontinued operations
Cash flows from operating activities	(0.7)	1.1
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	(0.7)	1.1
Net increase/(decrease) in cash and cash equivalents	(72.4)	(107.4)
Increase (Decrease) in Assets Held-for-sale		(0.1)
Cash and cash equivalents, beginning of period	1,661.5	838.2	838.2
Cash and cash equivalents, end of period	1,589.1	730.7
Consolidating/ Eliminating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(1.5)	(3.8)
Cash flows from investing activities
Acquisitions of property and equipment, net of change in related payables	0	3.8
Change in restricted cash	0	0
Payments to acquire businesses, net of transaction costs and cash acquired	0
Investments in/advances to non-consolidated affiliates and other	0	0
Proceeds received from sale of assets	0
Purchase of additional interests in subsidiaries		21.9
Dividends received		(37.2)
Purchases of investment securities	0	0
Proceeds from the sale and maturity of investment securities	0	0
Other	0	0
Cash flows from investing activities	0	(11.5)
Cash flows from financing activities
Proceeds from the issuance of long-term debt		0
Assumption of debt by non-guarantors		0
Debt issuance and extension costs and fees	0	0
Borrowings under lending agreements	0
Repayments under lending agreements	0
Repayments of Other Long-term Debt	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Cash paid for early extinguishments of debt	0	0
Dividends paid		37.2
Contributions from noncontrolling interest owners	0
Distributions to noncontrolling interest owners	0
Proceeds from issuance of common stock	0
Other	(0.2)	0
Transfers from/(to) affiliates	1.7	(21.9)
Cash flows from financing activities	1.5	15.3
Cash flows from discontinued operations
Cash flows from operating activities	0	0
Cash flows from investing activities	0	0
Cash flows from financing activities	0	0
Net cash from discontinued operations	0	0
Net increase/(decrease) in cash and cash equivalents	0	0
Increase (Decrease) in Assets Held-for-sale		0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	$ 0	$ 0