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Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 296,031 $ 278,233 $ 295,998 $ 279,268 $ 313,318 $ 273,746 $ 287,011 $ 256,708 $ 1,149,530 $ 1,130,783 $ 1,133,885
Gross profit 138,321 128,762 135,855 120,705 134,010 119,781 130,489 116,823 523,643 501,103 515,349
Net income attributable to continuing operations $ 25,216 $ 25,486 $ 29,306 $ 12,683 $ 20,840 $ 15,712 $ 23,722 $ 9,316 $ 92,691 $ 69,590 $ 87,447
Earnings per share attributable to continuing operations, basic (dollars per share) $ 0.67 $ 0.68 $ 0.78 $ 0.34 $ 0.56 $ 0.42 $ 0.63 $ 0.25 $ 2.47 $ 1.86 $ 2.34
Earnings per share attributable to continuing operations, diluted (dollars per share) $ 0.66 $ 0.67 $ 0.77 $ 0.34 $ 0.55 $ 0.41 $ 0.62 $ 0.25 $ 2.44 $ 1.84 $ 2.30
Net sales $ 0 $ 0 $ 0 $ 5,261 $ 8,854 $ 11,648 $ 11,384 $ 11,157 $ 5,261 $ 43,043  
Gross profit 0 0 0 442 1,616 2,170 2,326 2,167 442 8,279  
Net income attributable to discontinued operations $ (300) $ (1,300) $ 1,777 $ (932) $ 11 $ 264 $ 576 $ 366 $ (755) $ 1,217 $ 1,059
Earnings per share attributable to discontinued operations, basic (dollars per share) $ (0.01) $ (0.04) $ 0.05 $ (0.03) $ 0.00 $ 0.01 $ 0.02 $ 0.01 $ (0.02) $ 0.03 $ 0.03
Earnings per share attributable to discontinued operations, diluted (dollars per share) $ (0.01) $ (0.04) $ 0.05 $ (0.03) $ 0.00 $ 0.01 $ 0.01 $ 0.01 $ (0.02) $ 0.03 $ 0.03
Discontinued Operations, Held-for-sale or Disposed of by Sale | South African Distribution Business and Zambian Operations                      
Quarterly Financial Information Disclosure [Abstract]                      
Net sales                 $ 5,261 $ 43,043 $ 47,516
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Gain recorded in second quarter in discontinued operations     $ 2,500 $ 300