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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended
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Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Aug. 01, 2007 Maximum | Jun. 30, 2012 Employees | Jun. 30, 2012 Stock Repurchase Plan | Jul. 25, 2012 Dividend Declared | Jul. 25, 2012 Subsequent Event Maximum
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declaration date |  |  |  |  |  |  |  |  | Jul. 25, 2012 |
Dividend per share, declared |  |  |  |  |  |  |  |  | $ 0.05 |
Dividend payment date | Jun. 29, 2012 | Mar. 30, 2012 | Jun. 30, 2011 | Mar. 30, 2011 |  |  |  |  | Sep. 28, 2012 |
Dividend record date |  |  |  |  |  |  |  |  | Sep. 14, 2012 |
Amount approved for repurchases under stock buyback program |  |  |  |  |  | $ 250,000,000 |  |  |  | $ 150,000,000
Treasury stock shares acquired, Shares |  |  |  |  |  |  |  | 4,700,000 |  |
Treasury stock shares acquired, Value |  |  |  |  |  |  |  | 70,100,000 |  |
Amount authorized to purchase the Company's outstanding common stock under the program | 42,800,000 |  |  |  | 42,800,000 |  |  |  |  |
Treasury stock shares acquired |  |  |  |  |  |  | 83,229 |  |  |
Purchase price for treasury stock acquired |  |  |  |  | $ 71,337,000 |  | $ 1,200,000 |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: 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 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: 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=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7 -Subparagraph b -Chapter 1 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: 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 + Details
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