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Commitments and Contingencies (Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve [Abstract] |  |  |  |
Adjustments to previously recorded reserves | $ 0 | $ (1,700) | $ (59,362) | $ (18,338)

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- Definition Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve [Abstract] + References No definition available. + Details
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Namespace Prefix: | phm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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