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Segment Reporting - Financial Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 27, 2016
USD ($)
Dec. 22, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment reporting                                
Number of operating segments | segment                           4    
Total Revenues       $ 119,589 $ 104,185 $ 120,610 $ 124,668 $ 224,173 $ 120,409 $ 140,494 $ 149,727     $ 469,052 $ 634,803 $ 559,814
Income (loss) before income tax expense (benefit)       (2,146) (27,798) (9,658) (3,638) 104,645 3,190 (8,949) 22,340     (43,240) 121,226 64,987
Accrued settlement costs       24,450               $ 24,450   24,450    
Identifiable assets     $ 1,709,022 775,285       1,709,022       775,285   775,285 1,709,022 1,350,849
Capital purchases                           21,315 11,905 13,798
Depreciation and amortization                           43,523 44,151 49,384
Non-cash share based compensation                           25,620 16,667 15,359
Segment Reporting Information, Additional Information [Abstract]                                
Pre-tax gain on sale                           21 107,699  
Aggregate amount payable                 20,300              
Legal and related costs                             4,900  
Restructuring charge       5,265   4,355               9,620    
Tax charge     6,500 (7,862) (3,887) (4,441) $ (1,132) 22,308 $ 480 $ 1,261 $ 5,607     (17,322) 29,656 14,095
Amounts reclassified from accumulated other comprehensive loss                           1,066    
Settlement agreement for termination of Former CEO                                
Segment Reporting Information, Additional Information [Abstract]                                
Proceeds from insurer to settle claims         900               $ 900 900    
Legal and related costs                         2,700 1,800    
Net settlement charge                         4,800 4,800    
Insurance recovery       500   500           500 $ 500 500    
Settlement Agreement With SEC Involving Prereleased ADRs                                
Segment reporting                                
Accrued settlement costs       24,500               24,500   24,500    
Segment Reporting Information, Additional Information [Abstract]                                
Legal and related costs       1,300 $ 1,600             2,900        
Loss of Profits Due to Outage of Outsourced Primary Data Centre                                
Segment Reporting Information, Additional Information [Abstract]                                
Proceeds from insurer to settle claims           2,400                    
Employee separation and related costs                                
Segment Reporting Information, Additional Information [Abstract]                                
Restructuring charge       5,300                        
Reduction in trading and sales organizations and closing matched-book securities operations                                
Segment Reporting Information, Additional Information [Abstract]                                
Restructuring charge           $ 4,300                    
Operating Segments | U.S. Operations                                
Segment reporting                                
Total Revenues                           229,655 285,230 306,540
Income (loss) before income tax expense (benefit)                           (11,133) 16,000 35,803
Identifiable assets     1,304,995 396,419       1,304,995       396,419   396,419 1,304,995 929,062
Capital purchases                           15,547 7,748 10,645
Depreciation and amortization                           32,896 33,971 38,659
Non-cash share based compensation                           10,642 10,725 10,107
Operating Segments | Canadian Operations                                
Segment reporting                                
Total Revenues                           61,822 63,028 77,633
Income (loss) before income tax expense (benefit)                           11,564 10,643 17,259
Identifiable assets     76,561 80,943       76,561       80,943   80,943 76,561 105,898
Capital purchases                           2,549 2,175 1,656
Depreciation and amortization                           2,402 2,247 3,153
Non-cash share based compensation                           2,383 1,466 695
Operating Segments | European Operations                                
Segment reporting                                
Total Revenues                           125,945 129,729 127,410
Income (loss) before income tax expense (benefit)                           25,470 28,244 34,081
Identifiable assets     262,095 236,071       262,095       236,071   236,071 262,095 249,702
Capital purchases                           1,886 1,334 1,114
Depreciation and amortization                           6,741 6,560 6,422
Non-cash share based compensation                           5,948 4,505 2,891
Operating Segments | Asia Pacific Operations                                
Segment reporting                                
Total Revenues                           47,919 48,179 46,926
Income (loss) before income tax expense (benefit)                           1,553 1,620 (1,690)
Identifiable assets     65,371 $ 61,852       $ 65,371       $ 61,852   61,852 65,371 66,187
Capital purchases                           1,333 648 383
Depreciation and amortization                           1,484 1,373 1,150
Non-cash share based compensation                           925 866 979
Corporate                                
Segment reporting                                
Total Revenues                           3,711 108,637 1,305
Income (loss) before income tax expense (benefit)                           (70,694) 64,719 (20,466)
Non-cash share based compensation                           $ 5,722 $ (895) $ 687
Sale of subsidiaries | Energy research business                                
Segment Reporting Information, Additional Information [Abstract]                                
Cash proceeds from sale   $ 120,500 120,500                          
Pre-tax gain on sale   $ 107,699 $ 107,700                          
Sale of subsidiaries | ITG Investment Research                                
Segment Reporting Information, Additional Information [Abstract]                                
Cash proceeds from sale $ 12,000                              
Pre-tax gain on sale $ 21