Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Outstanding payables due to related party	$ 8,000	$ 12,000
Consulting Services
Related Party Transaction [Line Items]
Transaction expenses incurred by parent company	$ 200,000	$ 200,000	$ 200,000

Carrying amount as of the balance sheet date of obligations due all related parties.

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

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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