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Stock Based Compensation - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Jul. 31, 2012 | Jan. 31, 2012 | Jul. 31, 2011 | Jan. 31, 2011 | Jul. 31, 2010 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2010 | Mar. 31, 2010 | Jan. 31, 2013 Subsequent Event | Dec. 31, 2012 Stock Options | Dec. 31, 2012 Restricted Stock Units Employees | Dec. 31, 2012 Restricted Stock Units Director | May 31, 2009 Twenty Zero Six Incentive Compensation Plan | May 31, 2009 1996 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan to increase the number of shares issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 5,000,000
Aggregate number of shares issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,000,000 | 25,400,000
Period of stock granted to employees and executive officers vest in equal installments |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 4 years | 1 year |  |
Percentage of awards vesting on the first anniversary of grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Stock options term |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized expense related to non-vested restricted stock unit awards and stock options |  |  |  |  |  | $ 52,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized expense related to non-vested restricted stock unit awards and stock options expected to be recognized over weighted average period, in years |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum percent of shares allowed to purchase |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Fair market value |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares allowed to purchase |  |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock price paid |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock price paid on last business day of the purchase period |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to employees | 600,000 | 600,000 | 600,000 | 800,000 | 600,000 |  |  |  |  |  |  |  | 600,000 |  |  |  |  |
Value of common stock issued to employees per share |  |  |  |  |  |  | $ 11.91 | $ 11.69 | $ 11.59 | $ 11.65 | $ 8.12 | $ 8.29 |  |  |  |  |  |

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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 The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per 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 -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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