Investments and Marketable Securities - Aggregate Market Value and Unrealized Losses of Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Number of investments, Unrealized Loss Less 12 months	1	15
Aggregate Market Value, Unrealized Loss Less 12 months	$ 446	$ 11,417
Unrealized Losses, Unrealized Loss Less 12 months	0	(10)
Number of investments, Unrealized Loss Greater 12 months	15	69
Aggregate Market Value, Unrealized Loss Greater 12 months	12,085	84,505
Unrealized Losses, Unrealized Loss Greater 12 months	(14)	(713)
Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of investments, Unrealized Loss Less 12 months	0	0
Aggregate Market Value, Unrealized Loss Less 12 months	0	0
Unrealized Losses, Unrealized Loss Less 12 months	0	0
Number of investments, Unrealized Loss Greater 12 months	1	3
Aggregate Market Value, Unrealized Loss Greater 12 months	8,098	23,207
Unrealized Losses, Unrealized Loss Greater 12 months	0	(19)
State and Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of investments, Unrealized Loss Less 12 months	0	5
Aggregate Market Value, Unrealized Loss Less 12 months	0	7,368
Unrealized Losses, Unrealized Loss Less 12 months	0	(8)
Number of investments, Unrealized Loss Greater 12 months	2	4
Aggregate Market Value, Unrealized Loss Greater 12 months	1,169	6,559
Unrealized Losses, Unrealized Loss Greater 12 months	(4)	(20)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of investments, Unrealized Loss Less 12 months	1	9
Aggregate Market Value, Unrealized Loss Less 12 months	446	3,031
Unrealized Losses, Unrealized Loss Less 12 months	0	(2)
Number of investments, Unrealized Loss Greater 12 months	11	60
Aggregate Market Value, Unrealized Loss Greater 12 months	2,813	51,757
Unrealized Losses, Unrealized Loss Greater 12 months	(10)	(673)
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of investments, Unrealized Loss Less 12 months	0	1
Aggregate Market Value, Unrealized Loss Less 12 months	0	1,018
Unrealized Losses, Unrealized Loss Less 12 months	0	0
Number of investments, Unrealized Loss Greater 12 months	1	2
Aggregate Market Value, Unrealized Loss Greater 12 months	5	2,982
Unrealized Losses, Unrealized Loss Greater 12 months	$ 0	$ (1)

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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