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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 | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal rate of 35% |  |  |  |  |  |  |  |  | $ 39,680 | $ 34,569 | $ 32,606
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | (2,462) | (544) | 675
Change in valuation allowance |  |  |  |  |  |  |  |  | (9,066) | 3,521 | (1,615)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (5,710) | (5,508) | (4,650)
Unrecognized tax benefit increase |  |  |  |  |  |  |  |  | 2,977 | 65 | 488
Tax effect of foreign operations |  |  |  |  |  |  |  |  | 261 | (104) | 5,906
Acquisition Costs |  |  |  |  |  |  |  |  |  | 289 | 896
Tax benefit of research & development |  |  |  |  |  |  |  |  | (871) | (3,446) | (4,001)
Other |  |  |  |  |  |  |  |  | 3,128 | 2,367 | (1,014)
Income tax provision | $ 18,856 | $ 3,786 | $ 5,825 | $ (530) | $ 23,334 | $ 9,433 | $ 2,409 | $ (3,967) | $ 27,937 | $ 31,209 | $ 29,291

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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 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: 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 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 + Details
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