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Impact of Change in Accounting Policies - Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 322,656 $ 281,488 $ 262,179
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on disposal of property, plant and equipment 70 228 151
Depreciation expense 50,565 43,436 42,125
Amortization of intangibles 15,351 17,861 17,450
Amortization of government grants (47) (44) (44)
Interest on short term investments (1,329) (1,088) (823)
Realized (gain)/loss on sale of short term investments (56) (112) (50)
Gain on re-measurement of financial assets (800) 0 0
Amortization of gain on interest rate hedge (923) (923) (923)
Amortization of financing costs 812 556 566
Stock compensation expense 31,594 30,573 40,343
Deferred tax expense 1,652 10,729 1,545
Changes in assets and liabilities:      
Increase in accounts receivable (37,557) 57,747 2,526
Increase in unbilled revenue (98,510) (62,491) (16,753)
Decrease in other receivables 3,107 1,771 (1,829)
Increase in prepayments and other current assets (3,237) 4,359 1,872
Decrease in other non-current assets 856 (1,524) (2,157)
Decrease in payments on account (6,253) (7,174) (45,754)
Increase in other current liabilities 2,009 6,679 (44,713)
Decrease in other non-current liabilities (1,034) (3,710) 3,008
Decrease in income taxes payable (5,220) (2,293) (690)
Decrease in accounts payable (5,067) 7,014 1,175
Net cash provided by operating activities 268,639 383,082 259,204
Cash flows from investing activities:      
Purchase of property, plant and equipment (48,397) (44,717) (42,601)
Purchase of subsidiary undertakings (1,645) (144,131) (54,209)
Sale of available for sale investments 99,865 33,086 40,858
Purchase of available for sale investments (80,956) (41,701) (22,030)
Purchase of investments in equity - long term (6,163) 0 0
Net cash used in investing activities (37,296) (177,814) (74,814)
Cash flows from financing activities:      
Financing costs (823) 0 0
Proceeds from the exercise of equity compensation 16,842 13,950 10,180
Share issue costs (16) (15) (17)
Repurchase of ordinary shares (128,960) (133,106) (110,000)
Share repurchase costs (66) (106) (275)
Net cash used in financing activities (113,023) (119,277) (93,710)
Effect of exchange rate movements on cash (5,328) 4,327 (2,050)
Net increase in cash and cash equivalents 112,992 90,318 88,630
Cash and cash equivalents at beginning of year 282,859 192,541 103,911
Cash and cash equivalents at end of year 395,851 282,859 $ 192,541
Adjustments      
Cash flows from operating activities:      
Net income 3,709    
Adjustments | Accounting Standards Update 2014-09      
Cash flows from operating activities:      
Net income 3,709    
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on disposal of property, plant and equipment 0    
Depreciation expense 0    
Amortization of intangibles 0    
Amortization of government grants 0    
Interest on short term investments 0    
Realized (gain)/loss on sale of short term investments 0    
Gain on re-measurement of financial assets 0    
Amortization of gain on interest rate hedge 0    
Amortization of financing costs 0    
Stock compensation expense 0    
Deferred tax expense 5,680    
Changes in assets and liabilities:      
Increase in accounts receivable 0    
Increase in unbilled revenue 1,462    
Decrease in other receivables 12,580    
Increase in prepayments and other current assets 0    
Decrease in other non-current assets 0    
Decrease in payments on account 59,242    
Increase in other current liabilities (84,342)    
Decrease in other non-current liabilities 0    
Decrease in income taxes payable 1,669    
Decrease in accounts payable 0    
Net cash provided by operating activities 0    
Cash flows from investing activities:      
Purchase of property, plant and equipment 0    
Purchase of subsidiary undertakings 0    
Sale of available for sale investments 0    
Purchase of available for sale investments 0    
Purchase of investments in equity - long term 0    
Net cash used in investing activities 0    
Cash flows from financing activities:      
Financing costs 0    
Proceeds from the exercise of equity compensation 0    
Share issue costs 0    
Repurchase of ordinary shares 0    
Share repurchase costs 0    
Net cash used in financing activities 0    
Effect of exchange rate movements on cash 0    
Net increase in cash and cash equivalents 0    
Cash and cash equivalents at beginning of year 0    
Cash and cash equivalents at end of year 0 0  
Balance without adoption of Topic 606      
Cash flows from operating activities:      
Net income 326,365    
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on disposal of property, plant and equipment 70    
Depreciation expense 50,565    
Amortization of intangibles 15,351    
Amortization of government grants (47)    
Interest on short term investments (1,329)    
Realized (gain)/loss on sale of short term investments (56)    
Gain on re-measurement of financial assets (800)    
Amortization of gain on interest rate hedge (923)    
Amortization of financing costs 812    
Stock compensation expense 31,594    
Deferred tax expense 7,332    
Changes in assets and liabilities:      
Increase in accounts receivable (37,557)    
Increase in unbilled revenue (97,048)    
Decrease in other receivables 15,687    
Increase in prepayments and other current assets (3,237)    
Decrease in other non-current assets 856    
Decrease in payments on account 52,989    
Increase in other current liabilities (82,333)    
Decrease in other non-current liabilities (1,034)    
Decrease in income taxes payable (3,551)    
Decrease in accounts payable (5,067)    
Net cash provided by operating activities 268,639    
Cash flows from investing activities:      
Purchase of property, plant and equipment (48,397)    
Purchase of subsidiary undertakings (1,645)    
Sale of available for sale investments 99,865    
Purchase of available for sale investments (80,956)    
Purchase of investments in equity - long term (6,163)    
Net cash used in investing activities (37,296)    
Cash flows from financing activities:      
Financing costs (823)    
Proceeds from the exercise of equity compensation 16,842    
Share issue costs (16)    
Repurchase of ordinary shares (128,960)    
Share repurchase costs (66)    
Net cash used in financing activities (113,023)    
Effect of exchange rate movements on cash (5,328)    
Net increase in cash and cash equivalents 112,992    
Cash and cash equivalents at beginning of year 282,859    
Cash and cash equivalents at end of year $ 395,851 $ 282,859