Debt - Summary of Debt and Capital Lease Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total Debt	$ 1,341,555us-gaap_DebtAndCapitalLeaseObligations	$ 1,154,420us-gaap_DebtAndCapitalLeaseObligations
Less amounts due within one year	(377)	(599)
Total long-term debt	1,341,178	1,153,821
$1 Billion Credit Facility [Member]
Debt Instrument [Line Items]
Total Debt	586,500	509,500
$400 Million Term Loan Facility [Member]
Debt Instrument [Line Items]
Total Debt	398,000
5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	350,000	350,000
AC Hotel Notes Payable [Member]
Debt Instrument [Line Items]
Total Debt	6,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Total Debt	1,055	958
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt		$ 293,962

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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