Annual report pursuant to Section 13 and 15(d)

Dividends (Detail)

v3.3.1.900
Dividends (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 15, 2013
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dividend Declared [Line Items]          
Date of Record   Mar. 07, 2016      
Date Paid   Mar. 18, 2016      
Amount per Common Share $ 0.25 $ 0.27      
Total Dividends [1]     $ 116,456 $ 116,155 $ 106,817
First Quarter Dividend          
Dividend Declared [Line Items]          
Date Declared     Feb. 17, 2015 Feb. 14, 2014 Feb. 12, 2013
Date of Record     Mar. 04, 2015 Mar. 04, 2014 Mar. 04, 2013
Date Paid     Mar. 18, 2015 Mar. 19, 2014 Mar. 15, 2013
Amount per Common Share [2]     $ 0.25 $ 0.25 $ 0.21
Total Dividends [1]     $ 29,025 $ 29,015 $ 24,325
Second Quarter Dividend          
Dividend Declared [Line Items]          
Date Declared     May 18, 2015 May 22, 2014 May 24, 2013
Date of Record     Jun. 05, 2015 Jun. 06, 2014 Jun. 06, 2013
Date Paid     Jun. 19, 2015 Jun. 20, 2014 Jun. 20, 2013
Amount per Common Share [2]     $ 0.25 $ 0.25 $ 0.21
Total Dividends [1]     $ 29,075 $ 29,030 $ 24,348
Third Quarter Dividend          
Dividend Declared [Line Items]          
Date Declared     Aug. 20, 2015 Aug. 13, 2014 Aug. 15, 2013
Date of Record     Aug. 31, 2015 Aug. 28, 2014 Aug. 28, 2013
Date Paid     Sep. 11, 2015 Sep. 12, 2014 Sep. 12, 2013
Amount per Common Share [2]     $ 0.25 $ 0.25 $ 0.25
Total Dividends [1]     $ 29,080 $ 29,032 $ 28,992
Fourth Quarter Dividend          
Dividend Declared [Line Items]          
Date Declared     Nov. 13, 2015 Nov. 12, 2014 Nov. 19, 2013
Date of Record     Dec. 02, 2015 Dec. 02, 2014 Dec. 02, 2013
Date Paid     Dec. 16, 2015 Dec. 11, 2014 Dec. 11, 2013
Amount per Common Share [2]     $ 0.25 $ 0.25 $ 0.25
Total Dividends [1]     $ 29,276 $ 29,078 $ 29,152
[1] Of the dividends recorded during 2013, 2014 and 2015, $772, $530 and $593, respectively, were related to outstanding restricted stock units and will not be paid until such units vest. See Note 16.
[2] Beginning with the dividend declared on August 15, 2013, the Company's board of directors raised the quarterly dividend to $0.25 per common share.