Employee Benefit Plans - Pension Plan Participation and Contribution Summary (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Multiemployer Plans [Line Items]
Contributions	$ 46.9		$ 44.8		$ 41.7
Southern Nevada Culinary and Bartenders Pension Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	886016617
Pension Plan Number	001
Pension Protection Act Zone Status	Green		Green
FIP/RP Status Pending/Implemented	No
Contributions	18.7		16.3		14.6
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Jul. 31, 2013
Pension Plan of the UNITE HERE National Retirement Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	136130178
Pension Plan Number	001
Pension Protection Act Zone Status	Red		Red
FIP/RP Status Pending/Implemented	Implemented
Contributions	13.8		12.8		12.3
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Dec. 31, 2015
Western Conference of Teamsters Pension Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	916145047
Pension Plan Number	001
Pension Protection Act Zone Status	Green		Green
FIP/RP Status Pending/Implemented	No
Contributions	4.9		4.7		4.1
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2016
Nevada Resort Association IATSE Local 720 Retirement Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	510144767
Pension Plan Number	001
Pension Protection Act Zone Status	Green		Green
FIP/RP Status Pending/Implemented	No
Contributions	0.7		1.0		0.8
Surcharge Imposed	No
Central Pension Fund of the IUOE & Participating Employers1 [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	366052390	[1]
Pension Plan Number	001	[1]
Pension Protection Act Zone Status	Green	[1]	Green	[1]
FIP/RP Status Pending/Implemented	No	[1]
Contributions	5.0	[1]	5.6	[1]	5.7	[1]
Surcharge Imposed	No	[1]
Expiration Date of Collective-Bargaining Agreement	May 31, 2015	[1]
Local 68 Engineers Union Pension Plan2 [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	510176618	[2]
Pension Plan Number	001	[2]
Pension Protection Act Zone Status	Green	[2]	Green	[2]
FIP/RP Status Pending/Implemented	No	[2]
Contributions	1.5	[2]	1.6	[2]	1.7	[2]
Surcharge Imposed	No	[2]
Expiration Date of Collective-Bargaining Agreement	Dec. 31, 2015	[2]
NJ Carpenters Pension Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	226174423
Pension Plan Number	001
Pension Protection Act Zone Status	Yellow		Yellow
FIP/RP Status Pending/Implemented	Implemented
Contributions	0.4		0.4		0.3
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Dec. 31, 2015
Southwest Carpenters Pension Trust [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	956042875
Pension Plan Number	001
Pension Protection Act Zone Status	Green		Green
FIP/RP Status Pending/Implemented	No
Contributions	0.6		0.6		0.6
Surcharge Imposed	No
Other Funds [Member]
Multiemployer Plans [Line Items]
Contributions	$ 1.3		$ 1.8		$ 1.6

[1] Plan years begin 2/1/12 and 2/1/11

[2] Plan years begin 7/1/12 and 7/1/11