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v3.19.1

Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 1987 lease lease_extension lease_renewal | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Commitment And Contingencies [Line Items] |  |  |
Outstanding warranty insurance receivables |  | $ 37,519,000 | $ 37,597,000
Estimated remaining liabilities related to surety bonds |  | 13,600,000 | 33,367,000
Surety bonds |  |  |
Commitment And Contingencies [Line Items] |  |  |
Outstanding surety bonds |  | 653,900,000 | 685,700,000
Estimated remaining liabilities related to surety bonds |  | 415,200,000 | 423,400,000
Legal Reserve |  |  |
Commitment And Contingencies [Line Items] |  |  |
Legal reserves |  | $ 0 | $ 17,500,000
Office Leases |  |  |
Commitment And Contingencies [Line Items] |  |  |
Lease obligation original term |  | 10 years |
Equipment Leases | Minimum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Lease obligation original term |  | 3 years |
Equipment Leases | Maximum |  |  |
Commitment And Contingencies [Line Items] |  |  |
Lease obligation original term |  | 4 years |
Ground lease |  |  |
Commitment And Contingencies [Line Items] |  |  |
Lease obligation original term | 55 years |  |
Number of properties subject to ground leases | lease | 2 |  |
Ten Year Renewal Option | Ground lease |  |  |
Commitment And Contingencies [Line Items] |  |  |
Number of lease extensions | lease_renewal | 3 |  |
Term of lease extension | 10 years |  |
Forty-five Year Renewal Option | Ground lease |  |  |
Commitment And Contingencies [Line Items] |  |  |
Lease obligation original term | 45 years |  |
Number of properties subject to ground leases | lease | 1 |  |
Extension Through 2071 | Ground lease |  |  |
Commitment And Contingencies [Line Items] |  |  |
Number of ground leases extended | lease_extension | 1 |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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