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Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Dividend Declared [Line Items] |  |  |  |  |  |
Total dividend paid | $ 97,261 | [1] | $ 96,522 | [1] | $ 85,137 | [1]
First Quarter Dividend |  |  |  |  |  |
Dividend Declared [Line Items] |  |  |  |  |  |
Declaration Date | Feb. 03, 2012 |  | Feb. 24, 2011 |  | Feb. 25, 2010 |
Record Date | Mar. 02, 2012 |  | Mar. 04, 2011 |  | Mar. 05, 2010 |
Date Paid | Mar. 16, 2012 |  | Mar. 16, 2011 |  | Mar. 19, 2010 |
Dividends declared per common share | $ 0.21 | [2] | $ 0.21 | [2] | $ 0.18 | [2]
Total dividend paid | 24,141 | [1] | 24,056 | [1] | 20,104 | [1]
Second Quarter Dividend |  |  |  |  |  |
Dividend Declared [Line Items] |  |  |  |  |  |
Declaration Date | May 11, 2012 |  | May 12, 2011 |  | May 13, 2010 |
Record Date | Jun. 04, 2012 |  | Jun. 06, 2011 |  | Jun. 04, 2010 |
Date Paid | Jun. 19, 2012 |  | Jun. 17, 2011 |  | Jun. 18, 2010 |
Dividends declared per common share | $ 0.21 | [2] | $ 0.21 | [2] | $ 0.18 | [2]
Total dividend paid | 24,274 | [1] | 24,152 | [1] | 20,313 | [1]
Third Quarter Dividend |  |  |  |  |  |
Dividend Declared [Line Items] |  |  |  |  |  |
Declaration Date | Aug. 08, 2012 |  | Aug. 04, 2011 |  | Jul. 29, 2010 |
Record Date | Aug. 21, 2012 |  | Aug. 17, 2011 |  | Aug. 17, 2010 |
Date Paid | Sep. 05, 2012 |  | Sep. 01, 2011 |  | Sep. 01, 2010 |
Dividends declared per common share | $ 0.21 | [2] | $ 0.21 | [2] | $ 0.18 | [2]
Total dividend paid | 24,281 | [1] | 24,157 | [1] | 20,519 | [1]
Fourth Quarter Dividend |  |  |  |  |  |
Dividend Declared [Line Items] |  |  |  |  |  |
Declaration Date | Nov. 06, 2012 |  | Nov. 03, 2011 |  | Nov. 02, 2010 |
Record Date | Nov. 21, 2012 |  | Nov. 18, 2011 |  | Nov. 22, 2010 |
Date Paid | Dec. 07, 2012 |  | Dec. 07, 2011 |  | Dec. 07, 2010 |
Dividends declared per common share | $ 0.21 | [2] | $ 0.21 | [2] | $ 0.21 | [2]
Total dividend paid | $ 24,565 | [1] | $ 24,157 | [1] | $ 24,201 | [1]
[1] | Of the dividends recorded during 2010, 2011 and 2012, $635, $684 and $894, respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Notes 19 and 20.
[2] | Beginning with the dividend declared on November 2, 2010, the Company's board of directors raised the quarterly dividend to $0.21 per common share.

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