Business Combination - Additional Information (Detail) € in Thousands, $ in Thousands			3 Months Ended
	Feb. 16, 2015 USD ($) shares	Feb. 16, 2015 EUR (€) shares	Mar. 31, 2015 USD ($) MWh Plant	Feb. 16, 2015 EUR (€)	Jan. 15, 2015
CECEP [Member]
Business Acquisition [Line Items]
Number of Photovoltaic Plants | Plant			4
Power Generating Capacity (in Megawatt-hours) | MWh			4.3
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 194
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	42
CECEP Solar Energy Hong Kong Co., Limited [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired					100.00%
Payable settlement due to CECEP HK on behalf of CECEP	8,967			€ 7,870
Payments to Acquire Businesses, Gross	$ 3,561	€ 3,125
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares	5,722,977	5,722,977
Business Combination Cash Paid and Accounts Payable Total	$ 3,561	€ 3,125
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Accounts Payable to be Paid to Former Owner	$ 8,269
CECEP Solar Energy Hong Kong Co., Limited [Member] | Other Current Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			$ 2,283