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Revenue from Contracts with Customers - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract with customer, liability, noncurrent | $ 6,342,000 |
Contract with customer, asset, reclassified to receivable | 510,470,000 |
Contract with customer, asset, revenue recognized | 485,143,000 |
Contract with customer, liability, revenue recognized | 95,318,000 |
Contract with customer, liability, billings | 80,007,000 |
Revenue, remaining performance obligation | $ 1,660,800,000 |
Revenue, remaining performance obligation, percentage | 25.00% |
Capitalized commission costs | $ 927,000 | $ 927,000
Impairment charges in connection with the the Company's commissionn costs or project development costs | 0 |
Capitalized contract cost, project development costs | $ 15,672,000 |
Minimum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract receivable retainage percentage | 5.00% |
Maximum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract receivable retainage percentage | 10.00% |
Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Increase (decrease) in retained earnings |  | $ 4,454,000

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- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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