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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

Commitment and contingencies.

+ References

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Lessee, Operating Lease, Number Of Renewal Options

+ References

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- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

No definition available.

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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

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Term of lessee's operating lease, 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

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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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.

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Amount of liabilities classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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