Debt - Outstanding Debt (Detail) (USD $) In Millions, unless otherwise specified					9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended										9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended		9 Months Ended				9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended				9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 Revolving Credit Facility with Maturity of 2017 [Member]	Dec. 31, 2011 Revolving Credit Facility with Maturity of 2017 [Member]	Sep. 30, 2012 Credit Facilities Term Loan B4 [Member]	Dec. 31, 2011 Credit Facilities Term Loan B4 [Member]	Sep. 30, 2012 Credit Facilities Term Loan B5 [Member]	Dec. 31, 2011 Credit Facilities Term Loan B5 [Member]	Sep. 30, 2012 Credit Facilities Term Loans B6 [Member]	Sep. 30, 2012 Revolving credit facility with maturity of 2014 [Member]	Dec. 31, 2011 Revolving credit facility with maturity of 2014 [Member]	Sep. 30, 2012 Senior notes with maturity of 2017 [Member]	Dec. 31, 2011 Senior notes with maturity of 2017 [Member]	Sep. 30, 2012 Senior notes with maturity of 2020 [Member]	Feb. 29, 2012 Senior notes with maturity of 2020 [Member]	Sep. 30, 2012 Senior notes with maturity of 2020 one [Member]		Sep. 30, 2012 CMBS Financing [Member]		Apr. 30, 2012 CMBS Financing [Member]	Mar. 31, 2012 CMBS Financing [Member]	Jan. 31, 2012 CMBS Financing [Member]	Dec. 31, 2011 CMBS Financing [Member]	Apr. 30, 2011 CMBS Financing [Member]	Mar. 31, 2011 CMBS Financing [Member]	Sep. 30, 2012 Second-priority senior secured notes with maturity of 2018 one [Member]	Dec. 31, 2011 Second-priority senior secured notes with maturity of 2018 one [Member]	Sep. 30, 2012 Second-priority senior secured notes with maturity of 2018 two [Member]	Dec. 31, 2011 Second-priority senior secured notes with maturity of 2018 two [Member]	Sep. 30, 2012 Second priority senior secured notes with maturity of 2015 [Member]	Dec. 31, 2011 Second priority senior secured notes with maturity of 2015 [Member]	Sep. 30, 2012 Chester Downs Term Loan [Member]	Dec. 31, 2011 Chester Downs Term Loan [Member]	Sep. 30, 2012 Chester Downs Senior Secured Notes [Member]	Feb. 29, 2012 Chester Downs Senior Secured Notes [Member]	Sep. 30, 2012 Phw Las Vegas Senior Secured Loan [Member]		Dec. 31, 2011 Phw Las Vegas Senior Secured Loan [Member]	Sep. 30, 2012 Linq/Octavius Senior Secured Loan [Member]	Dec. 31, 2011 Linq/Octavius Senior Secured Loan [Member]	Sep. 30, 2012 Subsidiary-Guaranteed Senior Notes [Member]	Dec. 31, 2011 Subsidiary-Guaranteed Senior Notes [Member]	Sep. 30, 2012 Subsidiary-Guaranteed Senior PIK Toggle Notes [Member]	Dec. 31, 2011 Subsidiary-Guaranteed Senior PIK Toggle Notes [Member]	Sep. 30, 2012 Subsidiary-Guaranteed Senior PIK Toggle Notes [Member] Minimum [Member]	Sep. 30, 2012 Subsidiary-Guaranteed Senior PIK Toggle Notes [Member] Maximum [Member]	Sep. 30, 2012 Unsecured Senior Debt 5.375% [Member]	Dec. 31, 2011 Unsecured Senior Debt 5.375% [Member]	Sep. 30, 2012 Unsecured Senior Debt 7.0% [Member]	Dec. 31, 2011 Unsecured Senior Debt 7.0% [Member]	Sep. 30, 2012 Unsecured Senior Debt 5.625% [Member]	Dec. 31, 2011 Unsecured Senior Debt 5.625% [Member]	Sep. 30, 2012 Unsecured Senior Debt 6.5% [Member]	Dec. 31, 2011 Unsecured Senior Debt 6.5% [Member]	Sep. 30, 2012 Unsecured Senior Debt 5.75% [Member]	Dec. 31, 2011 Unsecured Senior Debt 5.75% [Member]	Sep. 30, 2012 Floating Rate Contingent Convertible Senior Notes [Member]	Dec. 31, 2011 Floating Rate Contingent Convertible Senior Notes [Member]	Sep. 30, 2012 Other Unsecured Borrowings Special Improvement District Bonds [Member]	Dec. 31, 2011 Other Unsecured Borrowings Special Improvement District Bonds [Member]	Sep. 30, 2012 Other Unsecured Borrowings, Other [Member]	Dec. 31, 2011 Other Unsecured Borrowings, Other [Member]	Sep. 30, 2012 Capital Lease Obligations [Member]	Dec. 31, 2011 Capital Lease Obligations [Member]	Sep. 30, 2012 Capital Lease Obligations [Member] Minimum [Member]	Sep. 30, 2012 Capital Lease Obligations [Member] Maximum [Member]	Sep. 30, 2012 Credit Facilities Term Loans B1-B3 [Member]
Debt Instrument [Line Items]
Debt Instruments Maturity Date					2017		2016		2018		2018	2014		2017		2020		2020	[1]	2015	[2]							2018		2018		2015		2016		2020		2015	[2]		2017		2016		2018				2013		2013		2015		2016		2017		2024		2037		Various		to 2014				2015
Senior secured notes issued by Chester Downs							9.50%		4.47%		5.47%			11.25%		8.50%	8.50%	9.00%		3.24%								12.75%		10.00%		10.00%				9.25%	9.25%	3.10%			9.25%		10.75%				10.75%	11.50%	5.375%		7.00%		5.625%		6.50%		5.75%		0.57%		530.00%						1.10%	9.49%	3.22%
Various rate of interest of debt																																																															Various
Aggregate principal amount of senior secured notes	$ 23,467.3				$ 1,985.7		$ 972.5		$ 1,222.7		$ 2,044.9			$ 2,095.0		$ 1,250.0		$ 750.0		$ 4,829.1		$ 50.2	$ 70.8	$ 1.0		$ 35.0	$ 73.5	$ 750.0		$ 4,553.1		$ 214.8				$ 330.0	$ 330.0	$ 515.6			$ 450.0		$ 478.6		$ 9.8				$ 125.2		$ 0.6		$ 364.5		$ 248.7		$ 147.9		$ 0.2		$ 64.3		$ 28.9		$ 35.2
Current Portion of Long-Term Debt	(800.8)	[1],[3]
Aggregate principal amount of senior secured notes	23,467.3				1,985.7		972.5		1,222.7		2,044.9			2,095.0		1,250.0		750.0		4,829.1		50.2	70.8	1.0		35.0	73.5	750.0		4,553.1		214.8				330.0	330.0	515.6			450.0		478.6		9.8				125.2		0.6		364.5		248.7		147.9		0.2		64.3		28.9		35.2
Long-Term Debt	22,666.5
Total Debt	20,758.5		19,799.9		1,985.7	5,000.5	956.1	961.2	1,218.7	1,218.2	2,027.9		155.0	2,058.7	2,054.6	1,250.0		750.0		4,825.0					5,026.0			742.7	742.1	2,224.6	2,131.2	171.2	164.2		221.3	330.0		433.0		417.9	446.3	445.9	478.6	478.6	9.8	8.6			114.5	108.6	0.6	0.6	301.7	287.7	198.2	190.6	106.6	107.2	0.2	0.2	64.3	65.7	28.9	0.4	35.2	13.6
Current Portion of Long-Term Debt	(797.3)	[1],[3]	(40.4)	[1],[3]
Total Debt	20,758.5		19,799.9		1,985.7	5,000.5	956.1	961.2	1,218.7	1,218.2	2,027.9		155.0	2,058.7	2,054.6	1,250.0		750.0		4,825.0					5,026.0			742.7	742.1	2,224.6	2,131.2	171.2	164.2		221.3	330.0		433.0		417.9	446.3	445.9	478.6	478.6	9.8	8.6			114.5	108.6	0.6	0.6	301.7	287.7	198.2	190.6	106.6	107.2	0.2	0.2	64.3	65.7	28.9	0.4	35.2	13.6
Long-Term Debt	$ 19,961.2		$ 19,759.5

[1] Represents the note offering that occurred in August 2012. Although the notes mature in 2020, they are classified as short-term obligations within our September 30, 2012 balance sheet because the escrow conditions were not met as of that date.

[2] Assumes the exercise of extension options to move the maturity from 2013 to 2015, subject to certain conditions.

[3] The CMBS Financing is not included in our current portion of long-term debt due to (b) above.