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Shareholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 139 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2013 Stock Option Plan 2013 | May 01, 2013 Stock Option Plan 2013 | Dec. 31, 2013 Employee Stock Option Plan | Dec. 31, 2013 Employee Stock Option Plan Upper end | Dec. 31, 2013 Employee Stock Purchase Plan | Dec. 31, 2012 Employee Stock Purchase Plan | Dec. 31, 2011 Employee Stock Purchase Plan | Dec. 31, 2013 Directors' Restricted Stock Plan 2008 | May 31, 2008 Directors' Restricted Stock Plan 2008 | Dec. 31, 2013 Non-Discretionary Plan | Dec. 31, 2013 Discretionary Plan | Feb. 24, 2014 Discretionary Plan Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |
Expected common stock shares issued and outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 190,000,000
Shares authorized for grant |  |  |  |  |  | 3,000,000 |  |  | 9,305,452 |  |  |  | 200,000 |  |  |
Grants, maximum number of shares per person |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Shares available for granting of awards |  |  |  |  | 284,150 |  |  |  |  |  |  | 0 |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 5 years |  |  |  | 1 year |  |  |  |
Maximum contractual term |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Purchase price percentage of fair market value |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
Issuance of shares under stock purchase plan |  |  |  | 8,139,481 |  |  |  |  |  |  |  |  |  |  |  |
Amount withheld employee stock purchase plan |  |  |  |  |  |  |  |  | $ 12,047,000 |  |  |  |  |  |  |
Fair value of annual grant per participant of restricted stock awards |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  |  |  |  |  | 35,868 |  |  |  |
Weighted average fair value of award granted during the period |  |  |  |  |  |  |  |  | $ 9.43 | $ 9.70 | $ 11.70 | $ 39.03 |  |  |  |
Total intrinsic value of options exercised | 24,000,000 | 39,000,000 | 47,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized share-based compensation cost | $ 82,000,000 |  |  | $ 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost, weighted average period | 2 years 10 months 25 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Total fair market value of annual grant of restricted stock awards per participant, under a restricted stock plan. + References No definition available. + Details
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- Definition The maximum number of options that can be granted per participant under an employee share-based plan. + References No definition available. + Details
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- Definition The maximum contractual term of equity (or liability) share options or similar instruments under an employee share-based plan. + References No definition available. + 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 Carrying value as of the balance sheet date of obligations incurred through that date and payable for employer-related costs not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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