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Quarterly financial information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of quarterly financial information
 
Mar 31
 
June 30
 
Sept 30
 
Dec 31
 
Total
 
($000 omitted, except per share)
Revenues:
 
 
 
 
 
 
 
 
 
2017
443,039

 
485,452

 
501,569

 
525,664

 
1,955,724

2016
438,229

 
489,437

 
553,210

 
525,764

 
2,006,640

Net income (loss) attributable to Stewart:
 
 
 
 
 
 
 
 
 
2017
4,087

 
18,568

 
10,944

 
15,060

 
48,659

2016
(11,195
)
 
23,599

 
26,375

 
16,699

 
55,478

Diluted earnings (loss) per share attributable to Stewart (1):
 
 
 
 
 
 
 
 
 
2017
0.17

 
0.79

 
0.46

 
0.64

 
2.06

2016
(0.48
)
 
0.49

 
1.12

 
0.71

 
1.85

 
(1) Quarterly per share data may not sum to annual totals due to rounding or effects of dilution in particular quarters but not in annual totals.