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Commitments and Contingencies - Additional Information (Detail) - USD ($)			12 Months Ended
	Dec. 09, 2014	Dec. 07, 2012	Dec. 31, 2015
December 7, 2012 Agreement [Member]
Commitment And Contingencies [Line Items]
Commitment towards investments in joint venture		$ 1,200,000
Contribution to joint venture		$ 850,000
December 9, 2014 Agreement [Member]
Commitment And Contingencies [Line Items]
Contribution to joint venture			$ 1.0
December 9, 2014 Agreement [Member] | Maximum [Member]
Commitment And Contingencies [Line Items]
Commitment towards investments in joint venture	$ 1,000,000

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Commitment And Contingencies [Line Items]

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