Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Cost Method Investments	$ 0	$ 0	$ 600
Amount of funding		$ 6,270
Percentage of marketable securities investments maturing within one year	92.00%	92.00%	87.00%
Percentage of marketable securities investments maturing within one to five years	8.00%	8.00%	13.00%
Other Debt Obligations
Investment Holdings [Line Items]
Fair value of loan from syndicate participant			$ 2,383
Fair Value, Inputs, Level 3 \| Other Debt Obligations
Investment Holdings [Line Items]
Fair value of loan from syndicate participant			$ 2,383
Minimum
Investment Holdings [Line Items]
Maturity term within one year (in years)	1 year		1 year
Maturity term within one to five years (in years)	1 year		1 year
Maximum
Investment Holdings [Line Items]
Maturity term within one to five years (in years)	5 years		5 years

Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value, Percentage

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Available-for-sale Securities, Debt Maturities, Next Twelve Months, Maturity Term

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Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value, Percentage

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Available-for-sale Securities, Debt Maturities, Year Two Through Five, Maturity Term

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ 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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

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-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The initial funding or additional funding of loans receivable to policy holders principally secured by the benefits under the policy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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