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Revenue from Contracts with Customers - Summary of Impact of Adoption (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings | $ 86,842 |  |  |  | $ 104,852 |  |  |  | $ 86,842 | $ 104,852 |  | $ 104,852
Prepaid expenses and other current assets (including amounts in VIEs of $190 and $8, respectively) | 11,571 |  |  |  | 14,037 |  |  |  | 11,571 | 14,037 |  | 14,037
Deferred income taxes, net |  |  |  |  |  |  |  |  |  |  |  | 0
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities (including amounts in VIEs of $4,233 and $149, respectively) | 35,947 |  |  |  | 23,260 |  |  |  | 35,947 | 23,260 |  | 23,260
Deferred income taxes, net | 4,352 |  |  |  |  |  |  |  | 4,352 |  |  | 584
Shareholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 269,806 |  |  |  | 235,844 |  |  |  | 269,806 | 235,844 |  | 235,844
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 217,371 | $ 205,375 | $ 196,982 | $ 167,410 | 211,133 | $ 204,744 | $ 166,665 | $ 134,610 | 787,138 | 717,152 | $ 651,227 |
Cost of revenues |  |  |  |  |  |  |  |  | 613,526 | 572,994 | 516,883 |
Gross profit | 49,201 | 46,162 | 42,776 | 35,473 | 41,459 | 41,367 | 35,408 | 25,924 | 173,612 | 144,158 | 134,344 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 114,513 | 107,570 | 110,568 |
Operating income |  |  |  |  |  |  |  |  | 59,099 | 36,588 | 23,776 |
Other expenses, net |  |  |  |  |  |  |  |  | 16,709 | 7,871 | 7,409 |
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 42,390 | 28,717 | 16,367 |
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 4,813 | (4,791) | 4,370 |
Net income |  |  |  |  |  |  |  |  | 37,577 | 33,508 | 11,997 |
Net loss attributable to redeemable non-controlling interest |  |  |  |  |  |  |  |  | 407 | 3,983 | 35 |
Net income attributable to common shareholders | $ 11,593 | $ 10,701 | $ 8,702 | $ 6,988 | $ 23,811 | $ 8,493 | $ 5,831 | $ (644) | $ 37,984 | $ 37,491 | $ 12,032 |
Basic income per share (in usd per share) | $ 0.25 | $ 0.23 | $ 0.19 | $ 0.15 | $ 0.52 | $ 0.19 | $ 0.13 | $ (0.01) | $ 0.83 | $ 0.82 | $ 0.26 |
Diluted income per share (in usd per share) | $ 0.24 | $ 0.23 | $ 0.19 | $ 0.15 | $ 0.52 | $ 0.19 | $ 0.13 | $ (0.01) | $ 0.81 | $ 0.82 | $ 0.26 |
Balances without adoption of Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings | $ 93,214 |  |  |  |  |  |  |  | $ 93,214 |  |  | 95,658
Prepaid expenses and other current assets (including amounts in VIEs of $190 and $8, respectively) | 10,644 |  |  |  |  |  |  |  | 10,644 |  |  | 18,380
Deferred income taxes, net |  |  |  |  |  |  |  |  |  |  |  | 1,003
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities (including amounts in VIEs of $4,233 and $149, respectively) | 34,877 |  |  |  |  |  |  |  | 34,877 |  |  | 24,450
Deferred income taxes, net | 6,123 |  |  |  |  |  |  |  | 6,123 |  |  | 0
Shareholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 274,550 |  |  |  |  |  |  |  | 274,550 |  |  | 231,390
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 784,316 |  |  |
Cost of revenues |  |  |  |  |  |  |  |  | 610,229 |  |  |
Gross profit |  |  |  |  |  |  |  |  | 174,087 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 114,513 |  |  |
Operating income |  |  |  |  |  |  |  |  | 59,574 |  |  |
Other expenses, net |  |  |  |  |  |  |  |  | 16,709 |  |  |
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 42,865 |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 4,998 |  |  |
Net income |  |  |  |  |  |  |  |  | 37,867 |  |  |
Net loss attributable to redeemable non-controlling interest |  |  |  |  |  |  |  |  | 407 |  |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | $ 38,274 |  |  |
Basic income per share (in usd per share) |  |  |  |  |  |  |  |  | $ 0.84 |  |  |
Diluted income per share (in usd per share) |  |  |  |  |  |  |  |  | $ 0.82 |  |  |
606 Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings | (6,372) |  |  |  |  |  |  |  | $ (6,372) |  |  | (9,194)
Prepaid expenses and other current assets (including amounts in VIEs of $190 and $8, respectively) | 927 |  |  |  |  |  |  |  | 927 |  |  | 4,343
Deferred income taxes, net |  |  |  |  |  |  |  |  |  |  |  | 1,003
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities (including amounts in VIEs of $4,233 and $149, respectively) | 1,070 |  |  |  |  |  |  |  | 1,070 |  |  | 1,190
Deferred income taxes, net | (1,771) |  |  |  |  |  |  |  | (1,771) |  |  | (584)
Shareholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ (4,744) |  |  |  |  |  |  |  | (4,744) |  |  | $ (4,454)
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,822 |  |  |
Cost of revenues |  |  |  |  |  |  |  |  | 3,297 |  |  |
Gross profit |  |  |  |  |  |  |  |  | (475) |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0 |  |  |
Operating income |  |  |  |  |  |  |  |  | (475) |  |  |
Other expenses, net |  |  |  |  |  |  |  |  | 0 |  |  |
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | (475) |  |  |
Income tax (benefit) provision |  |  |  |  |  |  |  |  | (185) |  |  |
Net income |  |  |  |  |  |  |  |  | (290) |  |  |
Net loss attributable to redeemable non-controlling interest |  |  |  |  |  |  |  |  | 0 |  |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | $ (290) |  |  |
Basic income per share (in usd per share) |  |  |  |  |  |  |  |  | $ (0.01) |  |  |
Diluted income per share (in usd per share) |  |  |  |  |  |  |  |  | $ (0.01) |  |  |

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