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Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Financial Data (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues before reimbursements |  | $ 257,421,000 |  | $ 253,124,000 |  | $ 234,416,000 |  | $ 237,531,000 |  | $ 247,186,000 |  | $ 254,677,000 |  | $ 256,881,000 |  | $ 247,058,000 |  | $ 982,492,000 |  | $ 1,005,802,000 |  |
Reimbursements |  | 8,184,000 |  | 8,545,000 |  | 8,459,000 |  | 8,515,000 |  | 10,376,000 |  | 11,165,000 |  | 10,965,000 |  | 9,319,000 |  | 33,703,000 |  | 41,825,000 |  |
Total revenues |  | 265,605,000 |  | 261,669,000 |  | 242,875,000 |  | 246,046,000 |  | 257,562,000 |  | 265,842,000 |  | 267,846,000 |  | 256,377,000 |  | 1,016,195,000 |  | 1,047,627,000 |  | $ 1,122,979,000
Total costs of services |  | 193,538,000 |  | 185,606,000 |  | 172,057,000 |  | 186,119,000 |  | 187,660,000 |  | 192,014,000 |  | 185,892,000 |  | 187,207,000 |  | 737,320,000 |  | 752,773,000 |  |
(Loss) Income before income taxes |  | 11,862,000 |  | 36,438,000 |  | 12,433,000 |  | (21,645,000) |  | (6,567,000) |  | 16,019,000 |  | 5,483,000 |  | 8,702,000 |  | 39,088,000 |  | 23,637,000 |  |
Unallocated corporate and shared costs and credits |  | (11,347,000) |  | (968,000) |  | (1,709,000) |  | (2,550,000) |  | (4,122,000) |  | (1,649,000) |  | 3,170,000 |  | (3,914,000) |  | (16,574,000) |  | (6,515,000) |  |
Impairment of goodwill |  |  |  |  |  |  |  | (17,674,000) | [1] | (17,484,000) |  |  |  |  |  |  |  | (17,674,000) | [1] | (17,484,000) |  | (1,056,000)
Net corporate interest expense |  | (1,648,000) |  | (1,599,000) |  | (2,452,000) |  | (2,224,000) |  | (2,428,000) |  | (3,162,000) |  | (2,468,000) |  | (2,716,000) |  | (7,923,000) |  | (10,774,000) |  |
Stock option expense |  | (89,000) |  | (457,000) |  | (286,000) |  | (290,000) |  | (537,000) |  | (450,000) |  | (413,000) |  | (485,000) |  | (1,122,000) |  | (1,885,000) |  |
Amortization of customer-relationship intangible assets |  | (2,500,000) |  | (3,665,000) |  | (2,732,000) |  | (2,756,000) |  | (2,848,000) |  | (2,829,000) |  | (2,802,000) |  | (2,798,000) |  | (11,653,000) |  | (11,277,000) |  |
Restructuring and other costs, net (4) | [1] | (2,419,000) |  |  |  |  |  | (5,714,000) |  |  |  |  |  |  |  |  |  | (8,133,000) |  |  |  |
Gain (loss) on disposition of businesses, net | [1] |  |  | 14,104,000 |  | (341,000) |  |  |  |  |  |  |  |  |  |  |  | 13,763,000 |  |  |  |
Income tax benefit (provision) |  | (2,459,000) |  | (11,729,000) |  | (6,311,000) |  | 8,486,000 |  | (2,991,000) |  | (5,328,000) |  | (2,859,000) |  | (2,933,000) |  | (12,013,000) |  | (14,111,000) |  | (18,542,000)
Net Loss Attributable to Noncontrolling Interests and Redeemable Noncontrolling Interests |  | (3,000) |  | (312,000) |  | (224,000) |  | 1,760,000 |  | 2,246,000 |  | 355,000 |  | 18,000 |  | 340,000 |  | 1,221,000 |  | 2,959,000 |  | 389,000
Net (Loss) Income Attributable to Shareholders of Crawford & Company |  | 9,400,000 |  | 24,397,000 |  | 5,898,000 |  | (11,399,000) |  | (7,312,000) |  | 11,046,000 |  | 2,642,000 |  | 6,109,000 |  | 28,296,000 |  | 12,485,000 |  | $ 25,978,000
(Loss) Earnings Per Share - Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arbitration and claim settlements (4) | [1] |  |  |  |  |  |  |  |  |  |  | (1,200,000) |  | (11,352,000) |  |  |  |  |  | (12,552,000) |  |
Crawford Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment operating earnings | [2] | 8,046,000 |  | 7,219,000 |  | 2,789,000 |  | (3,679,000) |  | 3,572,000 |  | 2,661,000 |  | 1,710,000 |  | (313,000) |  | 14,375,000 |  | 7,630,000 |  |
Crawford T P A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment operating earnings | [2] | 7,606,000 |  | 4,414,000 |  | 3,171,000 |  | 6,285,000 |  | 6,067,000 |  | 9,347,000 |  | 5,026,000 |  | 6,733,000 |  | 21,476,000 |  | 27,173,000 |  |
Crawford Specialty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment operating earnings | [2] | $ 14,213,000 |  | $ 17,390,000 |  | $ 13,993,000 |  | $ 6,957,000 |  | $ 11,213,000 |  | $ 13,301,000 |  | $ 12,612,000 |  | $ 12,195,000 |  | $ 52,553,000 |  | $ 49,321,000 |  |
Class A Non-Voting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Basic: |  | $ 0.18 | [3] | $ 0.46 | [3] | $ 0.11 | [3] | $ 0.21 | [3] | $ 0.13 | [3] | $ 0.22 | [3] | $ 0.06 | [3] | $ 0.12 | [3] | $ 0.54 | [3] | $ 0.27 | [3] | $ 0.51
(Loss) Earnings Per Share - Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Diluted: |  | 0.18 | [3] | 0.46 | [3] | 0.11 | [3] | 0.21 | [3] | 0.13 | [3] | 0.21 | [3] | 0.06 | [3] | 0.12 | [3] | 0.54 | [3] | 0.26 | [3] | 0.50
Class B Voting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Basic: |  | 0.18 | [3] | 0.46 | [3] | 0.11 | [3] | 0.23 | [3] | 0.15 | [3] | 0.19 | [3] | 0.04 | [3] | 0.10 | [3] | 0.52 | [3] | 0.19 | [3] | 0.43
(Loss) Earnings Per Share - Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) Earnings Per Share - Diluted: |  | $ 0.18 | [3] | $ 0.46 | [3] | $ 0.11 | [3] | $ 0.23 | [3] | $ 0.15 | [3] | $ 0.19 | [3] | $ 0.04 | [3] | $ 0.10 | [3] | $ 0.52 | [3] | $ 0.19 | [3] | $ 0.42
[1] | The Company recognized non-cash goodwill impairment in the amount of $17.7 million related to its Crawford Claims Solutions segment in the first quarter of 2020. The Company recognized non-cash goodwill impairment of $17.5 million related to its Crawford Claims Solutions reporting unit in the fourth quarter of 2019. See Note 4, "Goodwill and Intangible Assets" in the consolidated financial statements included in this Item 8. The Company recognized a pretax loss for Arbitration and claim settlements of $12.6 million in 2019. The Company recognized a pretax gain of $13.8 million due to the disposal of LWI, net of a loss on the disposal of Crawford Compliance in 2020. See Note 3, "Business Acquisitions and Dispositions" in the consolidated financial statements included in this Item 8. The Company recognized pretax restructuring and other costs in the first and fourth quarters of 2020 totaling $8.1 million. The provision for income taxes in 2020 and 2019 included the impact of these transactions and tax valuation adjustments.
[2] | This is a segment financial measure representing segment earnings before certain unallocated corporate and shared costs and credits, goodwill and intangible asset impairment charges, net corporate interest expense, stock option expense, amortization of customer-relationship intangible assets, restructuring and other costs, gain/loss on disposal of business, income taxes, and net income or loss attributable to noncontrolling interests and redeemable noncontrolling interests. See Note 13, "Segment and Geographic Information," in the consolidated financial statements contained in this Item 8.
[3] | Due to the method used in calculating per share data as prescribed by ASC 260, "Earnings Per Share," the quarterly per share data may not total to the full-year per share data.

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