Annual report pursuant to Section 13 and 15(d)

Summary of Quarterly Financial Data (Unaudited) - Consolidated Statements of Income by Quarter (Detail)

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Summary of Quarterly Financial Data (Unaudited) - Consolidated Statements of Income by Quarter (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 $ 2,315,369 $ 2,242,197 $ 2,202,436 $ 2,083,166 $ 2,188,735 $ 2,127,721 $ 2,121,946 $ 1,927,066 $ 8,843,168 $ 8,365,468 $ 7,520,806
Gross profit 338,700 326,081 323,806 313,020 314,119 304,428 312,852 303,754 1,301,607 1,235,153 1,158,611
Net income (loss) $ 28,084 $ 23,327 $ 8,916 $ 21,291 $ 30,382 $ 10,042 $ 28,179 $ 20,498 $ 81,618 $ 89,101 $ 76,254
Earnings (loss) per common share - Basic $ 0.53 $ 0.44 $ 0.17 $ 0.40 $ 0.55 $ 0.18 $ 0.53 $ 0.39 $ 1.54 $ 1.64 $ 1.44
Earnings (loss) per common share - Diluted $ 0.53 $ 0.44 $ 0.17 $ 0.40 $ 0.55 $ 0.18 $ 0.47 $ 0.35 $ 1.53 $ 1.53 $ 1.29