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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 346,140 $ 296,129 $ 288,775 $ 265,765 $ 296,031 $ 278,233 $ 295,998 $ 279,268 $ 1,196,809 $ 1,149,530 $ 1,130,783
Gross profit 154,572 132,499 133,605 119,722 138,321 128,762 135,855 120,705 540,398 523,643 501,103
Net income attributable to continuing operations $ (32,984) $ 32,066 $ 12,532 $ 14,413 $ 25,216 $ 25,486 $ 29,306 $ 12,683 $ 26,027 $ 92,691 $ 69,590
Earnings per share attributable to continuing operations, basic (dollars per share) $ (0.87) $ 0.84 $ 0.33 $ 0.38 $ 0.67 $ 0.68 $ 0.78 $ 0.34 $ 0.68 $ 2.47 $ 1.86
Earnings per share attributable to continuing operations, diluted (dollars per share) $ (0.87) $ 0.83 $ 0.32 $ 0.37 $ 0.66 $ 0.67 $ 0.77 $ 0.34 $ 0.67 $ 2.44 $ 1.84
Net sales $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 5,261 $ 0 $ 5,261  
Gross profit 0 0 0 0 0 0 0 442 0 442  
Net (loss) income attributable to discontinued operations $ 0 $ 0 $ 0 $ 0 $ (300) $ (1,300) $ 1,777 $ (932) $ 0 $ (755) $ 1,217
Earnings per share attributable to discontinued operations, basic (dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ (0.01) $ (0.04) $ 0.05 $ (0.03) $ 0.00 $ (0.02) $ 0.03
Earnings per share attributable to discontinued operations, diluted (dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ (0.01) $ (0.04) $ 0.05 $ (0.03) $ 0.00 $ (0.02) $ 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                 $ 0 $ 5,261 $ 43,043
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Gain recorded in second quarter in discontinued operations       $ 300     $ 2,500