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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 189,407	$ 125,085
Unrealized Gains	16	46
Unrealized Losses	(47)	(1)
Estimated Fair Value	189,376	125,130
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	23,122	7,599
Estimated Fair Value	23,122	7,599
Cash and Cash Equivalents | Cash
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,766	1,542
Estimated Fair Value	1,766	1,542
Cash and Cash Equivalents | Money market funds
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	20,013	3,140
Estimated Fair Value	20,013	3,140
Cash and Cash Equivalents | US Government Agencies Debt Securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,343	2,202
Estimated Fair Value	1,343	2,202
Cash and Cash Equivalents | Municipal Securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		715
Estimated Fair Value		715
Available-for-sale Securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	166,285	117,486
Unrealized Gains	16	46
Unrealized Losses	(47)	(1)
Estimated Fair Value	166,254	117,531
Available-for-sale Securities | US Government Agencies Debt Securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	166,285	116,986
Unrealized Gains	16	46
Unrealized Losses	(47)	(1)
Estimated Fair Value	166,254	117,031
Available-for-sale Securities | US Treasury Securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		500
Estimated Fair Value		$ 500

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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 210.5-02.2)

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

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