Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Balance	$ 294,414,522	$ 7,545,854
Purchase accounting adjustment for Merger		(7,545,854)
Goodwill from Merger		294,414,522
Measurement period adjustments	1,238,376
Foreign currency translation adjustment	(3,788,125)
Balance	564,723,498	294,414,522
HTA
Goodwill [Line Items]
Goodwill from Merger	232,032,774
EPC
Goodwill [Line Items]
Goodwill from Merger	40,825,951
Government Solutions
Goodwill [Line Items]
Balance	159,746,649	2,617,950
Purchase accounting adjustment for Merger		(2,617,950)
Goodwill from Merger		159,746,649
Balance	159,746,649	159,746,649
Commercial Services
Goodwill [Line Items]
Balance	134,667,873	4,927,904
Purchase accounting adjustment for Merger		(4,927,904)
Goodwill from Merger		134,667,873
Measurement period adjustments	1,238,376
Foreign currency translation adjustment	(3,788,125)
Balance	404,976,849	$ 134,667,873
Commercial Services \| HTA
Goodwill [Line Items]
Goodwill from Merger	232,032,774
Commercial Services \| EPC
Goodwill [Line Items]
Goodwill from Merger	$ 40,825,951

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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