Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	1 Months Ended					6 Months Ended	12 Months Ended			6 Months Ended
	Jun. 30, 2013 Litigation Related to Other Taxes	Jun. 30, 2013 Litigation Related to Other Taxes	Dec. 31, 2012 Litigation Related to Other Taxes	Jun. 30, 2013 City of San Francisco	Jan. 11, 2013 2000 - 2011 Tax Assessment Litigation Related to Other Taxes	Jan. 11, 2013 2000 - 2011 Tax Assessment Litigation Related to Other Taxes Excise Tax Related Liabilities	Jan. 11, 2013 2000 - 2011 Tax Assessment Litigation Related to Other Taxes Accrued Interest	Mar. 15, 2013 2000 - 2011 Tax Assessment Litigation Related to Other Taxes Penalties and Interest Thereon	May 20, 2013 2012 Tax Assessment Litigation Related to Other Taxes	Jun. 30, 2013 Litigation relating to occupancy tax LegalMatter	Dec. 31, 2010 Litigation relating to occupancy tax	Dec. 31, 2009 Litigation relating to occupancy tax	Dec. 31, 2012 Litigation relating to occupancy tax	Jun. 30, 2013 Matters relating to hotel booking practices
Loss Contingencies [Line Items]
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes										84
Number of lawsuits currently active										38
Number of lawsuits dismissed to date										33
Number of dismissals based on finding that defendant was not subject to local hotel occupancy tax or the local government lacked standing to pursue claims										20
Reserve for legal contingencies	$ 17	$ 17								$ 42			$ 35
Accrual related to court decisions and final settlements related to hotel occupancy taxes										1
Occupancy tax assessments tax payment (refund)											3	48
Tax assessments including interest and penalites				22.0	110.0	78.0	32.0	60.0	20.5
Tax penalties on assessment, percentage								50.00%
Litigation relating to general excise tax, expense		60	110
Estimate of possible amounts in excess of accrual		25
Pay-to-play general excise tax payment	$ 153
Number of Putative class action law suits														34