Annual report pursuant to Section 13 and 15(d)

Dividends (Detail)

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Dividends (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
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.