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Share-based Awards - Additional Information (Detail) (USD $)	3 Months Ended					3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Employee Stock Plan, 2008 Plan	Mar. 31, 2013 Employee Stock Plan, 2008 Plan Individual Employee	Mar. 31, 2013 Employee Stock Plan, 2008 Plan Minimum	Mar. 31, 2013 Stock Option	Mar. 31, 2012 Stock Option	Mar. 31, 2013 Stock Option Minimum	Mar. 31, 2013 Stock Option Maximum	Mar. 31, 2013 Restricted Stock Units (RSUs)	Mar. 31, 2012 Restricted Stock Units (RSUs)	Mar. 31, 2013 Employee Stock Plan, 2003 Plan	Mar. 31, 2013 Employee Stock Plan, 2003 Plan Individual Employee	Apr. 23, 2013 Restricted Stock Units 2013 Subsequent Event	Jul. 21, 2008 Restricted Stock Units 2008
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	1,600,000	1,000,000
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 7 days			8 years
Options granted fair value								$ 3.68	$ 13.93
Weighted average fair value per option						$ 8.71
Exercisable - number of shares						2,390,668
Exercisable - weighted average remaining contractual life						3 years 4 months 24 days
Exercisable - weighted average exercise price						$ 24.32
Fully vested total intrinsic value						21,400,000
Intrinsic value of option exercised						3,500,000	800,000
Fair value of RSU's vested										0	0
Non-cash stock compensation expense not yet recognized	17,900,000
Unrecognized stock-based compensation expense, weighted average period (years)	3 years
Tax benefit on exercise of options	$ 251,000	$ 400,000

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Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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.

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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.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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).

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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.

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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.

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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.

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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.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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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.

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