Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
6.05% Subordinated Notes
Debt Disclosure [Line Items]
Stated interest rate	6.05%	6.05%
5.375% Senior Notes
Debt Disclosure [Line Items]
Stated interest rate	5.375%	5.375%
7.0% Junior Subordinated Debentures
Debt Disclosure [Line Items]
Stated interest rate	7.00%	7.00%
Fair Value, Measurements, Recurring
Debt Disclosure [Line Items]
Transfers Into Level 3	$ 0	$ 0	$ 24,217
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(2,422)	(381,982)	(10,903)
Fair Value, Measurements, Recurring \| Fair value accounting \| Non-marketable securities
Debt Disclosure [Line Items]
Transfers Into Level 3	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	(380,262)	(3,561)
Fair Value, Measurements, Recurring \| Other venture capital investments \| Fair value accounting \| Non-marketable securities
Debt Disclosure [Line Items]
Transfers Into Level 3	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 0	$ (126)	$ (3,561)

Debt Disclosure [Line Items]

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

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