Merger and Acquisition - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)	Dec. 31, 2018	Apr. 06, 2018	Mar. 01, 2018	Dec. 31, 2017	May 31, 2017	Dec. 31, 2016	Jan. 27, 2016
Assets acquired
Goodwill	$ 564,723,498			$ 294,414,522		$ 7,545,854
ATS Merger
Assets acquired
Cash					$ 9,112,114
Restricted cash					1,229,118
Accounts receivable					50,908,663
Prepaid expense and other current assets					7,764,515
Installation and service parts					9,109,702
Property and equipment					64,596,596
Goodwill					294,414,522
Intangible assets					222,500,000
Other non-current assets					1,122,588
Total assets acquired					660,757,818
Liabilities assumed
Accounts payable and accrued expenses					22,565,224
Other long-term liabilities					9,310,190
Deferred tax liability					80,687,311
Total liabilities assumed					112,562,725
Total purchase price					548,195,093
ATS Merger | Customer Relationships
Assets acquired
Intangible assets					99,600,000
ATS Merger | Developed Technology
Assets acquired
Intangible assets					84,500,000
ATS Merger | Trademarks
Assets acquired
Intangible assets					24,800,000
ATS Merger | Non-compete Agreements
Assets acquired
Intangible assets					$ 13,600,000
HTA Merger
Assets acquired
Cash			$ 2,995,722
Accounts receivable			10,219,709
Prepaid expense and other current assets			5,266,168
Installation and service parts			296,535
Property and equipment			995,816
Goodwill			233,271,150
Total assets acquired			622,345,100
Liabilities assumed
Accounts payable and accrued expenses			14,267,971
Deferred tax liability			4,733,044
Total liabilities assumed			19,001,015
Total purchase price			603,344,085
HTA Merger | Customer Relationships
Assets acquired
Intangible assets			242,500,000
HTA Merger | Developed Technology
Assets acquired
Intangible assets			72,800,000
HTA Merger | Trademarks
Assets acquired
Intangible assets			5,500,000
HTA Merger | Non-compete Agreements
Assets acquired
Intangible assets			$ 48,500,000
EPC Merger
Assets acquired
Cash		$ 9,029,240
Other assets		1,948,150
Goodwill		40,825,951
Total assets acquired		76,203,341
Liabilities assumed
Accounts payable and accrued expenses		8,994,939
Deferred tax liability		4,273,117
Total liabilities assumed		13,268,056
Total purchase price		62,935,285
EPC Merger | Customer Relationships
Assets acquired
Intangible assets		19,400,000
EPC Merger | Developed Technology
Assets acquired
Intangible assets		3,900,000
EPC Merger | Trademarks
Assets acquired
Intangible assets		$ 1,100,000
Sunshine Acquisition
Assets acquired
Accounts receivable							$ 46,073
Property and equipment							88,273
Goodwill							4,927,904
Total assets acquired							22,998,250
Liabilities assumed
Advanced deposits payable							1,765,261
Total purchase price							21,232,989
Sunshine Acquisition | Customer Relationships
Assets acquired
Intangible assets							17,196,000
Sunshine Acquisition | Non-compete Agreements
Assets acquired
Intangible assets							3,000
Sunshine Acquisition | Software
Assets acquired
Intangible assets							250,000
Sunshine Acquisition | Tradename
Assets acquired
Intangible assets							$ 487,000