Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Expenses And Other Liabilities [Line Items]
Accrued employee compensation	$ 22,758	$ 21,353
CEE acquisition consideration		5,000
Accrued professional fees	4,073	3,480
Other accrued expenses	24,482	19,313
Total	59,261	$ 49,146
Clean Energy Experts, LLC
Accrued Expenses And Other Liabilities [Line Items]
CEE Compensation expense	$ 7,948