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Capital Stock and Dividends - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2010 | Aug. 05, 2011 | Nov. 23, 2010 | Nov. 08, 2010 | Oct. 07, 2010 | Jun. 30, 2010 Year | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Feb. 29, 2012 Dividend Declared
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  |
Common stock, par value |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Preferred stock, shares authorized |  |  |  |  |  |  | 10,000,000 |  |  |
Preferred stock, par value |  |  |  |  |  |  | $ 0.01 |  |  |
Common stock Authorized for repurchase |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |  |
Period of common stock repurchase |  |  |  |  |  | 3 |  |  |  |
Repurchases of common stock |  |  |  |  |  |  | 441,416 |  |  |
Dollar amount of common stock intended to purchase through modified dutch auction tender offer |  |  |  |  | 175,000,000 |  |  |  |  |
Common stock repurchased, purchase price per share |  |  |  |  |  |  | $ 35.79 |  |  |
Common stock purchased through modified dutch auction tender offer - in shares |  |  |  | 5,035,971 |  |  |  |  |  |
Common stock repurchased, total purchase price |  |  |  |  |  |  | 15,797,000 | 247,825,000 |  |
Common stock purchased through modified dutch auction tender offer - price per share |  |  |  | $ 34.75 |  |  |  |  |  |
Common stock purchased through modified dutch auction tender offer - total purchase price in dollars |  |  |  | 175,000,000 |  |  |  |  |  |
Fees and expenses incurred related to the modified dutch auction tender offer |  |  |  | 800,000 |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement - in shares |  |  | 2,071,509 |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement - price per share |  |  | $ 34.75 |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement - total purchase price in dollars |  |  | 72,000,000 |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer - in shares | 7,107,480 |  |  |  |  |  |  |  |  |
Percentage shares of common stock repurchased to outstanding common stock | 9.20% |  |  |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer- price per share | $ 34.75 |  |  |  |  |  |  |  |  |
Common stock purchased from stockholders under stock purchase agreement and through tender offer - total purchase price in dollars | 247,000,000 |  |  |  |  |  |  |  |  |
Treasury shares issued |  |  |  |  |  |  | 374,071 | 163,428 | 139,400 |
Average cost for restricted stock units |  |  |  |  |  |  | $ 6.63 | $ 6.63 | $ 6.63 |
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested |  |  |  |  |  |  | 142,080 | 51,038 | 44,802 |
Common stock repurchased, average cost |  |  |  |  |  |  | $ 36.58 | $ 28.82 | $ 24.79 |
Dividends declared on common stock |  |  |  |  |  |  | 31,109,000 | 31,957,000 | 29,352,000 |
Treasury stock, shares |  |  |  |  |  |  | 17,635,907 | 17,426,482 |  |
Cash dividend declared per share amount |  |  |  |  |  |  |  |  |  | $ 0.12
Cash dividend payable date |  |  |  |  |  |  |  |  |  | Mar. 26, 2012
Dividend payable, date of record for common stock holders |  |  |  |  |  |  |  |  |  | Mar. 12, 2012
Expected payment of quarterly dividend |  |  |  |  |  |  |  |  |  | $ 8,500,000

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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