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Income Taxes - 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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | [1] | Mar. 31, 2016 | [1] | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal rate of 35% |  |  |  |  |  |  |  |  | $ 64,953 | $ 39,680 | $ 34,569
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 7,060 | (2,462) | (544)
Change in valuation allowance |  |  |  |  |  |  |  |  | (8,524) | (9,066) | 3,521
Foreign tax rate differential |  |  |  |  |  |  |  |  | (11,830) | (5,710) | (5,508)
Unrecognized tax benefit increase |  |  |  |  |  |  |  |  | 1,045 | 2,977 | 65
Tax effect of foreign operations |  |  |  |  |  |  |  |  | 5,988 | 261 | (104)
Acquisition costs |  |  |  |  |  |  |  |  | 28 |  | 289
Tax benefit of research & development |  |  |  |  |  |  |  |  | (1,088) | (871) | (3,446)
Other |  |  |  |  |  |  |  |  | (1,586) | 3,128 | 2,367
Income tax provision | $ 43,171 | $ (6,426) | $ (17,669) | $ 36,970 | $ 18,856 | $ 3,786 | $ 5,825 | $ (530) | $ 56,046 | $ 27,937 | $ 31,209
[1] | As previously discussed in Note 1, Nature of Business and Summary of Significant Accounting Policies, the Company adopted ASU 2016-09 during the year ended December 31, 2016. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the adoption to the Company's previously reported quarterly results for the quarters ended March 31 and June 30, 2016 are reflected in the table above.

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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=65882285&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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