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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jul. 20, 2017 | Jan. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 41,709 | $ 344,100 |
All Acquisitions 2018 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | $ 39,291 |  |  | 39,300 |  |
Value of Quanta common stock issued | 13,549 |  | $ 13,500 |  |  |
Contingent consideration | 13,705 |  |  | 13,705 | 13,705 |
Fair value of total consideration transferred or estimated to be transferred | 66,545 |  |  |  |  |
Accounts receivable | 4,436 |  |  | 4,436 | 4,436 |
Contract assets | 0 |  |  | 0 | 0 |
Other current assets | 5,722 |  |  | 5,722 | 5,722 |
Property and equipment | 6,716 |  |  | 6,716 | 6,716 |
Other assets | 543 |  |  | 543 | 543 |
Identifiable intangible assets | 19,836 |  |  | 19,836 | 19,836 |
Contract liabilities | 0 |  |  | 0 | 0 |
Other current liabilities | (8,238) |  |  | (8,238) | (8,238) |
Deferred tax liabilities, net | (4,179) |  |  | (4,179) | (4,179) |
Other long-term liabilities | 0 |  |  | 0 | 0 |
Total identifiable net assets | 24,836 |  |  | 24,836 | 24,836 |
Goodwill | 41,709 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | 66,545 |  |  | 66,545 | 66,545 |
Stronghold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | 351,014 | $ 351,000 |  |  |  |
Value of Quanta common stock issued | 81,337 | 81,300 |  |  |  |
Contingent consideration | 51,084 | $ 51,100 |  | 51,084 | 51,084 |
Fair value of total consideration transferred or estimated to be transferred | 483,435 |  |  |  |  |
Accounts receivable | 77,478 |  |  | 77,478 | 77,478 |
Contract assets | 11,913 |  |  | 11,913 | 11,913 |
Other current assets | 20,914 |  |  | 20,914 | 20,914 |
Property and equipment | 51,258 |  |  | 51,258 | 51,258 |
Other assets | 1,513 |  |  | 1,513 | 1,513 |
Identifiable intangible assets | 95,700 |  |  | 95,700 | 95,700 |
Contract liabilities | (13,489) |  |  | (13,489) | (13,489) |
Other current liabilities | (58,346) |  |  | (58,346) | (58,346) |
Deferred tax liabilities, net | 0 |  |  | 0 | 0 |
Other long-term liabilities | (48) |  |  | (48) | (48) |
Total identifiable net assets | 186,893 |  |  | 186,893 | 186,893 |
Goodwill | 296,542 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | 483,435 |  |  | 483,435 | 483,435 |
Acquisitions 2017, other than Stronghold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | 11,904 |  |  |  |  | $ 11,900
Value of Quanta common stock issued | 8,267 |  |  |  |  | $ 8,300
Contingent consideration | 0 |  |  | 0 | 0 |
Fair value of total consideration transferred or estimated to be transferred | 20,171 |  |  |  |  |
Accounts receivable | 7,157 |  |  | 7,157 | 7,157 |
Contract assets | 193 |  |  | 193 | 193 |
Other current assets | 170 |  |  | 170 | 170 |
Property and equipment | 1,480 |  |  | 1,480 | 1,480 |
Other assets | 12 |  |  | 12 | 12 |
Identifiable intangible assets | 8,091 |  |  | 8,091 | 8,091 |
Contract liabilities | (93) |  |  | (93) | (93) |
Other current liabilities | (2,705) |  |  | (2,705) | (2,705) |
Deferred tax liabilities, net | 0 |  |  | 0 | 0 |
Other long-term liabilities | 0 |  |  | 0 | 0 |
Total identifiable net assets | 14,305 |  |  | 14,305 | 14,305 |
Goodwill | 5,866 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | $ 20,171 |  |  | $ 20,171 | $ 20,171 |

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