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Share-based Awards - Additional Information (Detail) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Employee Stock Plan, 2008 Plan | Jun. 30, 2013 Employee Stock Plan, 2008 Plan Individual Employee | Jun. 30, 2013 Employee Stock Plan, 2008 Plan Minimum | Jun. 30, 2013 Employee Stock Plan, 2003 Plan | Jun. 30, 2013 Employee Stock Plan, 2003 Plan Individual Employee | Jul. 21, 2008 Restricted Stock Units 2008 | Apr. 23, 2013 Restricted Stock Units And Performance Stock Units 2013 | Jun. 30, 2013 Employee Stock Option | Jun. 30, 2012 Employee Stock Option | Jun. 30, 2013 Employee Stock Option Minimum | Jun. 30, 2013 Employee Stock Option Maximum | Jun. 30, 2013 Restricted Stock Units (RSUs) | Jun. 30, 2012 Restricted Stock Units (RSUs) | Jun. 30, 2013 Performance Share Unit (PSUs) Minimum | Jun. 30, 2013 Performance Share Unit (PSUs) Maximum
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 |  |  |  |  |  |  |
Shares expiration period |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |
Weighted Average Remaining Contractual Life of Options Outstanding |  |  |  |  |  |  |  |  |  | 4 years 6 months 18 days |  |  | 8 years |  |  |  |
Options granted fair value |  |  |  |  |  |  |  |  |  |  |  | $ 3.68 | $ 13.93 |  |  |  |
Weighted average fair value per option |  |  |  |  |  |  |  |  |  | $ 8.81 |  |  |  |  |  |  |
Exercisable - number of shares |  |  |  |  |  |  |  |  |  | 2,203,758 |  |  |  |  |  |  |
Exercisable - weighted average remaining contractual life |  |  |  |  |  |  |  |  |  | 3 years 3 months 26 days |  |  |  |  |  |  |
Exercisable - weighted average exercise price |  |  |  |  |  |  |  |  |  | $ 24.40 |  |  |  |  |  |  |
Fully vested total intrinsic value |  |  |  |  |  |  |  |  |  | 24,300,000 |  |  |  |  |  |  |
Intrinsic value of option exercised |  |  |  |  |  |  |  |  |  | 7,800,000 | 3,200,000 |  |  |  |  |  |
Fair value of stock units vested |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 0 |  |
Number of shares expected to vest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 369,020
Cumulative EPS vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 | 2015
Non-cash stock compensation expense not yet recognized | 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period (years) | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit on exercise of options | $ 193,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Grants in Period, Weighted Average Option Price + References No definition available. + Details
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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 Unrecognized cost of unvested 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently 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 -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 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 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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- Definition Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock. + References No definition available. + Details
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