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Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal rate of 35% |  |  |  |  |  |  |  |  | $ 32,606 | $ 22,844 | $ 22,510
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 675 | 655 | 1,475
Change in valuation allowance |  |  |  |  |  |  |  |  | (1,615) | (2,680) | 251
Foreign tax rate differential |  |  |  |  |  |  |  |  | (4,650) | (8,940) | (1,572)
Unrecognized tax benefit increase (decrease) |  |  |  |  |  |  |  |  | 488 | (1,665) | (1,882)
Effect of intellectual property transfer |  |  |  |  |  |  |  |  |  |  | (2,100)
Tax effect of foreign operations |  |  |  |  |  |  |  |  | 5,906 | 5,311 | 373
Acquisition Costs |  |  |  |  |  |  |  |  | 896 | 2,659 |
Tax benefit of research & development |  |  |  |  |  |  |  |  | (4,001) | (1,749) |
Other |  |  |  |  |  |  |  |  | (1,014) | (13) | (594)
Income tax provision | $ 24,108 | $ 5,347 | $ 2,280 | $ (2,444) | $ 24,347 | $ (1,175) | $ (6,195) | $ (555) | $ 29,291 | $ 16,422 | $ 18,461

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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