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Income taxes - Summary of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in unrecognized tax benefits |  |  |
Balance as of beginning of year | $ 12,843 | $ 15,043 | $ 17,300
Additions based on tax positions related to the current year | 0 | 40 | 156
Additions for tax positions of prior years | 0 | 2,631 | 11
Reductions for tax positions of prior years | (959) | 0 | (636)
Settlements | (288) | (182) | (852)
Reductions due to lapse of statutes of limitations | (3,546) | (4,689) | (936)
Balance as of end of year | $ 8,050 | $ 12,843 | $ 15,043

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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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