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Accrued Expenses - Accrued Expense (Parenthetical) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accrued And Other Liabilities [Line Items]
Long-term deferred revenue	$ 30,602,000	$ 33,286,000
Sponsor fees	$ 24,000,000

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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