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Changes in Liability for Unrecognized Gross Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Uncertain tax positions at beginning of year | $ 33,357 | $ 33,681 | $ 33,487
Additions for tax positions relating to current-year operations | 925 |  | 4,332
Additions for tax positions relating to prior tax years | 2,036 | 1,660 | 1,398
Subtractions for tax positions relating to prior tax years | (569) | (1,984) | (5,101)
Reductions in balance due to settlements |  |  | (435)
Uncertain tax positions at end of year | $ 35,749 | $ 33,357 | $ 33,681

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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