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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Related Party Transaction [Line Items]
Amounts owed to related party	$ 523		$ 454
GCUF [Member]
Related Party Transaction [Line Items]
Contribution by University to GCUF	200	5
Amounts owed to related party	$ 0		$ 0

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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