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Equity Incentive Schemes and Stock Compensation Charges - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Employee Stock Plan, 2008 Plan | Dec. 31, 2013 Employee Stock Plan, 2008 Plan Individual Employee | Dec. 31, 2013 Employee Stock Plan, 2008 Plan Minimum | Dec. 31, 2013 Employee Stock Plan, 2003 Plan | Dec. 31, 2013 Employee Stock Plan, 2003 Plan Individual Employee | Dec. 31, 2013 Restricted Stock Units 2008 | Apr. 23, 2013 Restricted Stock Units 2013 | Dec. 31, 2013 Performance Share Unit (PSUs) | Dec. 31, 2012 Performance Share Unit (PSUs) | Dec. 31, 2013 Performance Share Unit (PSUs) Minimum | Dec. 31, 2013 Performance Share Unit (PSUs) Maximum | Dec. 31, 2013 Employee Stock Option | Dec. 31, 2013 Employee Stock Option | Dec. 31, 2013 Employee Stock Option Maximum | Dec. 31, 2013 Restricted Stock Units (RSUs) | Dec. 31, 2012 Restricted Stock Units (RSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of option price for fair value of ordinary share |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance |  |  |  | 6,000,000 | 400,000 |  | 6,000,000 | 400,000 | 1,000,000 | 1,600,000 |  |  |  |  |  |  |  |  |
Maximum number of award as percentage of shares outstanding |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |
Shares expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |
Contractual term of options outstanding | 4 years 6 months 7 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |
Weighted Average Remaining Contractual Life of Options Exercisable | 3 years 3 months 15 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options Expected to Vest | 655,224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic Value Of Options Exercised | $ 18,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic Value Of Options Outstanding | 48,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic Value Of Options Exercisable | 23,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Cost of shares awarded |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Fair value of stock units vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 0
Stock units vested |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  | 50,000 |
Number of shares expected to vest |  |  |  |  |  |  |  |  |  |  |  |  |  | 353,244 |  |  |  |  |
Cumulative EPS vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 2013 | 2015 |  |  |  |  |
Share-based compensation expense | 14,220,000 | 11,521,000 | 9,355,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash stock compensation expense not yet recognized | 34,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period (years) | 2 years 6 months 4 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit on exercise of options | $ 1,651,000 | $ 1,274,000 | $ 681,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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