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Quarterly Operating Results (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 343,165 $ 359,310 $ 325,792 $ 335,012 $ 302,830 $ 303,800 $ 290,916 $ 302,486 $ 1,363,279 $ 1,200,032 $ 1,013,542
Total expenses 266,723 263,855 239,571 235,521 233,603 222,151 219,771 219,696 1,005,670 895,221 743,021
Income before income taxes 76,442 95,455 86,221 99,491 69,227 81,649 71,145 82,790 357,609 304,811 270,521
Net income $ 47,225 $ 57,749 $ 52,007 $ 60,131 $ 42,637 $ 49,504 $ 42,471 $ 49,433 $ 217,112 $ 184,045 $ 163,995
Net income per share:                      
Basic $ 0.32 $ 0.40 $ 0.36 $ 0.42 $ 0.30 $ 0.34 $ 0.30 $ 0.34 $ 1.50 $ 1.28 $ 1.15
Diluted $ 0.32 $ 0.39 $ 0.36 $ 0.41 $ 0.29 $ 0.34 $ 0.29 $ 0.34 $ 1.48 $ 1.26 $ 1.13