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Quarterly financial data - Condensed Consolidated Statement of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interim Reporting [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 117,365 | $ 107,857 | $ 113,423 | $ 108,936 | $ 118,639 | $ 111,510 | $ 108,216 | $ 103,606 | $ 447,581 | $ 441,971 | $ 462,571
Cost of sales | 24,944 | 24,384 | 27,547 | 21,378 | 27,300 | 23,126 | 22,755 | 22,346 | 98,253 | 95,527 | 97,093
Gross profit | 92,421 | 83,473 | 85,876 | 87,558 | 91,339 | 88,384 | 85,461 | 81,260 | 349,328 | 346,444 | 365,478
Operating expense | 66,808 | 64,668 | 71,578 | 69,638 | 83,165 | 67,417 | 73,102 | 116,860 | 272,692 | 340,544 | 299,494
Operating income (loss) | 25,613 | 18,805 | 14,298 | 17,920 | 8,174 | 20,967 | 12,359 | (35,600) | 76,636 | 5,900 | 65,984
Net income (loss) from continuing operations, net of tax | 16,009 | 10,574 | 9,870 | 8,597 | 7,652 | 11,300 | 6,579 | (41,749) | 45,050 | (16,218) | 30,997
Net income (loss) from discontinued operations, net of tax | 5,152 | (5,558) | (2,616) | 810 | 235 | (1,225) | (1,184) | 282 | (2,212) | (1,892) | 13,299
Net income (loss) | 21,161 | 5,016 | 7,254 | 9,407 | 7,887 | 10,075 | 5,395 | (41,467) | 42,838 | (18,110) | 44,296
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.83 | $ 0.55 | $ 0.52 | $ 0.46 | $ 0.42 | $ 0.61 | $ 0.36 | $ (2.33) | $ 2.37 | $ (0.89) | $ 1.76
Net income (loss) from discontinued operations, net of tax | $ 0.27 | $ (0.29) | $ (0.14) | $ 0.04 | $ 0.01 | $ (0.07) | $ (0.07) | $ 0.02 | $ (0.12) | $ (0.10) | $ 0.76
Net income (loss) | $ 1.10 | $ 0.26 | $ 0.38 | $ 0.50 | $ 0.43 | $ 0.54 | $ 0.29 | $ (2.31) | $ 2.25 | $ (0.99) | $ 2.52
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.81 | $ 0.54 | $ 0.51 | $ 0.45 | $ 0.41 | $ 0.60 | $ 0.35 | $ (2.33) | $ 2.32 | $ (0.89) | $ 1.73
Net income (loss) from discontinued operations, net of tax | $ 0.26 | $ (0.29) | $ (0.14) | $ 0.04 | $ 0.01 | $ (0.06) | $ (0.06) | $ 0.02 | $ (0.11) | $ (0.10) | $ 0.74
Net income (loss) | $ 1.07 | $ 0.25 | $ 0.37 | $ 0.49 | $ 0.42 | $ 0.54 | $ 0.29 | $ (2.31) | $ 2.21 | $ (0.99) | $ 2.47
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 112,035 | 114,752 | 119,492 | 116,041 | 123,085 | 117,306 | 116,670 | 113,060 | 462,320 | 470,121 | 460,629
Cost of sales | 18,504 | 22,373 | 23,676 | 21,939 | 23,239 | 23,854 | 23,186 | 22,340 | 86,492 | 92,619 | 90,461
Gross profit | 93,531 | 92,379 | 95,816 | 94,102 | 99,846 | 93,452 | 93,484 | 90,720 | 375,828 | 377,502 | 370,168
Operating expense | 69,050 | 70,846 | 75,251 | 71,671 | 84,035 | 69,853 | 74,088 | 118,217 | 286,818 | 346,193 | 303,918
Operating income (loss) | 24,481 | 21,533 | 20,565 | 22,431 | 15,811 | 23,599 | 19,396 | (27,497) | 89,010 | 31,309 | 66,250
Net income (loss) from continuing operations, net of tax | 14,636 | 13,118 | 13,967 | 12,215 | 11,530 | 12,951 | 10,519 | (36,740) | 53,936 | (1,740) | 27,758
Net income (loss) from discontinued operations, net of tax | 5,878 | (5,558) | (2,762) | (199) | 862 | (573) | (561) | 939 | (2,641) | 667 | 16,450
Net income (loss) | 20,514 | 7,560 | 11,205 | 12,016 | 12,392 | 12,378 | 9,958 | (35,801) | 51,295 | (1,073) |
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.76 | $ 0.69 | $ 0.74 | $ 0.65 | $ 0.62 | $ 0.70 | $ 0.58 | $ (2.05) | $ 2.84 | $ (0.10) | $ 1.58
Net income (loss) from discontinued operations, net of tax | $ 0.30 | $ (0.29) | $ (0.15) | $ (0.01) | $ 0.05 | $ (0.03) | $ (0.03) | $ 0.05 | $ (0.14) | $ 0.04 | $ 0.93
Net income (loss) | $ 1.06 | $ 0.40 | $ 0.59 | $ 0.64 | $ 0.67 | $ 0.67 | $ 0.55 | $ (2.00) | $ 2.70 | $ (0.06) | $ 2.51
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.74 | $ 0.67 | $ 0.73 | $ 0.64 | $ 0.62 | $ 0.69 | $ 0.57 | $ (2.05) | $ 2.78 | $ (0.10) | $ 1.55
Net income (loss) from discontinued operations, net of tax | $ 0.30 | $ (0.28) | $ (0.15) | $ (0.01) | $ 0.04 | $ (0.03) | $ (0.03) | $ 0.05 | $ (0.14) | $ 0.04 | $ 0.92
Net income (loss) | $ 1.04 | $ 0.39 | $ 0.58 | $ 0.63 | $ 0.66 | $ 0.66 | $ 0.54 | $ (2.00) | $ 2.64 | $ (0.06) | $ 2.47
Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 5,330 | (6,895) | (6,069) | (7,105) | (4,446) | (5,796) | (8,454) | (9,454) | (14,739) | (28,150) | 1,942
Cost of sales | 6,440 | 2,011 | 3,871 | (561) | 4,061 | (728) | (431) | 6 | 11,761 | 2,908 | 6,632
Gross profit | (1,110) | (8,906) | (9,940) | (6,544) | (8,507) | (5,068) | (8,023) | (9,460) | (26,500) | (31,058) | (4,690)
Operating expense | (2,242) | (6,178) | (3,673) | (2,033) | (870) | (2,436) | (986) | (1,357) | (14,126) | (5,649) | (4,424)
Operating income (loss) | 1,132 | (2,728) | (6,267) | (4,511) | (7,637) | (2,632) | (7,037) | (8,103) | (12,374) | (25,409) | (266)
Net income (loss) from continuing operations, net of tax | 1,373 | (2,544) | (4,097) | (3,618) | (3,878) | (1,651) | (3,940) | (5,009) | (8,886) | (14,478) | 3,239
Net income (loss) from discontinued operations, net of tax | (726) |  | 146 | 1,009 | (627) | (652) | (623) | (657) | 429 | (2,559) | (3,151)
Net income (loss) | $ 647 | $ (2,544) | $ (3,951) | $ (2,609) | $ (4,505) | $ (2,303) | $ (4,563) | $ (5,666) | $ (8,457) | $ (17,037) |
Basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.07 | $ (0.14) | $ (0.22) | $ (0.19) | $ (0.20) | $ (0.09) | $ (0.22) | $ (0.28) | $ (0.47) | $ (0.79) | $ 0.18
Net income (loss) from discontinued operations, net of tax | $ (0.03) |  | $ 0.01 | $ 0.05 | $ (0.04) | $ (0.04) | $ (0.04) | $ (0.03) | $ 0.02 | $ (0.14) | $ (0.17)
Net income (loss) | $ 0.04 | $ (0.14) | $ (0.21) | $ (0.14) | $ (0.24) | $ (0.13) | $ (0.26) | $ (0.31) | $ (0.45) | $ (0.93) | $ 0.01
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax | $ 0.07 | $ (0.13) | $ (0.22) | $ (0.19) | $ (0.21) | $ (0.09) | $ (0.22) | $ (0.28) | $ (0.46) | $ (0.79) | $ 0.18
Net income (loss) from discontinued operations, net of tax | $ (0.04) | $ (0.01) | $ 0.01 | $ 0.05 | $ (0.03) | $ (0.03) | $ (0.03) | $ (0.03) | $ 0.03 | $ (0.14) | $ (0.18)
Net income (loss) | $ (0.03) | $ (0.14) | $ (0.21) | $ (0.14) | $ (0.24) | $ (0.12) | $ (0.25) | $ (0.31) | $ (0.43) | $ (0.93) |

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