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Accrued Expenses - Accrued Expenses (Parenthetical) (Detail) (USD $)	1 Months Ended	6 Months Ended
	Apr. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Long-term deferred revenue		$ 27,410,000	$ 33,286,000
Sponsor fees	$ 1,000,000	$ 24,000,000
Sponsor management termination fees, description		Subsequent to June 30, 2013, the remaining balance due to the Sponsors was paid in full.

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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