Business Combinations - Allocation of Purchase Price (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Identifiable assets acquired and liabilities assumed
Goodwill (b+c- a)	$ 67,462	$ 66,045
CECEP Solar Energy (Luxembourg) Private Limited Company (S.a.r.l.) [Member]
Identifiable assets acquired and liabilities assumed
Cash and cash equivalents	1,389
Accounts receivable	394
Other receivable	1,137
Property, plant and equipment	11,041
Deferred tax asset	180
Accounts payable	(244)
Income tax payable	(130)
Other accrued liabilities	(1,234)
Loans payable	(884)
Identifiable net assets acquired	11,649
Consideration and Payment Settlement (b)	11,830
Non-controlling interests (c)	1,236
Goodwill (b+c- a)	$ 1,417