Accounts Payable and Accrued Expenses - Summary of Current Portion of Earn-out Liabilities and Long term Portion of Earn-out Liability (Details) - USD ($)			12 Months Ended
	Dec. 15, 2014	Aug. 13, 2014	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition Contingent Consideration [Line Items]
Balance of earn-out at December 31, 2015			$ 32,670,000	$ 24,268,000
Fair value adjustment			4,218,000	11,222,000
Compensation expense adjustment			1,213,000	1,223,000
Foreign currency translation adjustment			(1,346,000)
Exchange of earn-out for accounts receivable			(3,272,000)
Payment			(9,270,000)	(2,488,000)
Total earn-out liability as of December 31, 2016			24,213,000	32,670,000
Less: current portion of earn-out			(13,527,000)	(14,757,000)
Balance of long term portion of earn-out recorded in other liabilities at December 31, 2016			10,686,000	17,913,000
Foreign currency translation adjustment				(1,555,000)
Zhongli [Member]
Business Acquisition Contingent Consideration [Line Items]
Balance of earn-out at December 31, 2015			26,951,000	16,997,000
Fair value adjustment	$ 17,100,000		6,485,000	11,222,000
Foreign currency translation adjustment			(1,292,000)
Exchange of earn-out for accounts receivable			(3,272,000)
Payment			(6,929,000)
Total earn-out liability as of December 31, 2016	$ 0		21,943,000	26,951,000
Less: current portion of earn-out			(12,562,000)	(11,657,000)
Balance of long term portion of earn-out recorded in other liabilities at December 31, 2016			9,381,000	15,294,000
Foreign currency translation adjustment				(1,268,000)
SAT [Member]
Business Acquisition Contingent Consideration [Line Items]
Balance of earn-out at December 31, 2015			1,000,000	1,000,000
Fair value adjustment			(1,000,000)
Total earn-out liability as of December 31, 2016				1,000,000
Less: current portion of earn-out				(333,000)
Balance of long term portion of earn-out recorded in other liabilities at December 31, 2016				667,000
HEE [Member]
Business Acquisition Contingent Consideration [Line Items]
Balance of earn-out at December 31, 2015			1,267,000	2,000,000
Fair value adjustment		$ 2,000,000	(1,267,000)
Payment				(733,000)
Total earn-out liability as of December 31, 2016				1,267,000
Less: current portion of earn-out				(667,000)
Balance of long term portion of earn-out recorded in other liabilities at December 31, 2016				600,000
Other Subsidiaries [Member]
Business Acquisition Contingent Consideration [Line Items]
Balance of earn-out at December 31, 2015			3,452,000	4,271,000
Compensation expense adjustment			1,213,000	1,223,000
Foreign currency translation adjustment			(54,000)
Payment			(2,341,000)	(1,755,000)
Total earn-out liability as of December 31, 2016			2,270,000	3,452,000
Less: current portion of earn-out			(965,000)	(2,100,000)
Balance of long term portion of earn-out recorded in other liabilities at December 31, 2016			$ 1,305,000	1,352,000
Foreign currency translation adjustment				$ (287,000)