Discontinued Operations - Additional Information (Detail) - USD ($)		12 Months Ended
Jan. 09, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Discontinued Operations And Disposal Groups
Gross proceeds from sale of wholly owned subsidiary	$ 77,900,000
Payment for final working capital adjustment from buyer	$ 100,000
Repurchase reserve		$ 0		$ 0
Gain on sale of NABCO			$ 39,700,000
Recovery of allowance for repurchase reserve		$ 700,000	$ 4,800,000

Accrued mortgage loan repurchase reserve as a result of representations and warranties made at time of sale.

No definition available.

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- Definition

Provision for or recovery of the mortgage loan repurchase reserve.

+ References

No definition available.

+ Details

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- Definition

Amount paid to or received from the buyer of a business, adjusting the final purchase price, related to the final working capital adjustment.

+ References

No definition available.

+ Details

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- Definition

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759

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- References

No definition available.

+ Details

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- Definition

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

+ References

No definition available.

+ Details

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