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Detail of Certain Balance Sheet Accounts | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Detail of Certain Balance Sheet Accounts | DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS: Activity in Quanta’s current and long-term allowance for doubtful accounts consisted of the following (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Balance at beginning of year |  | $ | 2,752 |  |  | $ | 5,226 |
Charged to bad debt expense (recoveries of bad debt expense) |  | 87 |  |  | (543 | )
Deductions for uncollectible receivables written off (recoveries of uncollectible receivables) |  | 1,626 |  |  | (1,931 | )
Balance at end of year |  | $ | 4,465 |  |  | $ | 2,752 |
Contracts in progress were as follows (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Costs incurred on contracts in progress |  | $ | 7,912,999 |  |  | $ | 6,687,484 |
Estimated earnings, net of estimated losses |  | 1,092,303 |  |  | 766,560 |
|  | 9,005,302 |  |  | 7,454,044 |
Less — Billings to date |  | (8,941,397 | ) |  | (7,255,582 | )
|  | $ | 63,905 |  |  | $ | 198,462 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 497,292 |  |  | $ | 473,308 |
Less — Billings in excess of costs and estimated earnings on uncompleted contracts |  | (433,387 | ) |  | (274,846 | )
|  | $ | 63,905 |  |  | $ | 198,462 |
Property and equipment consisted of the following (in thousands):
| Estimated Useful |  | December 31,
| Lives in Years |  | 2017 |  | 2016
Land | N/A |  | $ | 48,832 |  |  | $ | 45,919 |
Buildings and leasehold improvements | 5-30 |  | 155,628 |  |  | 137,515 |
Operating equipment and vehicles | 5-25 |  | 1,834,715 |  |  | 1,634,850 |
Office equipment, furniture and fixtures and information technology systems | 3-10 |  | 170,115 |  |  | 145,174 |
Construction work in progress | N/A |  | 60,587 |  |  | 73,461 |
|  |  | 2,269,877 |  |  | 2,036,919 |
Less — Accumulated depreciation and amortization |  |  | (981,275 | ) |  | (862,825 | )
Property and equipment, net |  |  | $ | 1,288,602 |  |  | $ | 1,174,094 |
Accounts payable and accrued expenses consisted of the following (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Accounts payable, trade |  | $ | 632,931 |  |  | $ | 529,608 |
Accrued compensation and related expenses |  | 225,193 |  |  | 194,056 |
Accrued insurance, current portion |  | 64,112 |  |  | 60,880 |
Deferred revenues, current portion |  | 15,967 |  |  | 15,512 |
Income and franchise taxes payable |  | 19,635 |  |  | 40,765 |
Other accrued expenses |  | 99,622 |  |  | 81,998 |
|  | $ | 1,057,460 |  |  | $ | 922,819 |

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