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Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (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] |  |  |  |  |  |  |  |  |  |  |
Income tax expense at federal statutory rate |  |  |  |  |  |  |  |  | $ 36,885 | $ 35,494 | $ 11,134
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 1,587 | 3,494 | 3,270
Benefit from lower foreign tax rates |  |  |  |  |  |  |  |  | (5,973) | (4,154) | (5,214)
Non-deductible goodwill impairment |  |  |  |  |  |  |  |  |  |  | 29,313
Valuation allowance on foreign tax credits & net operating loss carryforward |  |  |  |  |  |  |  |  | 2,326 | 4,604 | 8,206
Other expenses not deductible for tax purposes |  |  |  |  |  |  |  |  | 2,719 | 2,962 | 2,872
Changes in non-taxable contingent consideration |  |  |  |  |  |  |  |  |  |  | (2,777)
Other adjustments, net |  |  |  |  |  |  |  |  | 1,789 | 204 | (4,399)
Income tax provision | $ 7,577 | $ 6,177 | $ 13,922 | $ 11,657 | $ 9,702 | $ 12,329 | $ 10,225 | $ 10,348 | $ 39,333 | $ 42,604 | $ 42,405

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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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