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Cash Equivalents and Investments - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Short-Term	$ 6,769us-gaap_HeldToMaturitySecuritiesCurrent	$ 6,035us-gaap_HeldToMaturitySecuritiesCurrent
Long-Term	63,802us-gaap_HeldToMaturitySecuritiesNoncurrent	64,082us-gaap_HeldToMaturitySecuritiesNoncurrent
Municipal Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-Term	6,273us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	5,539us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Long-Term	35,316us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	35,827us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Federal Home Loan Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Long-Term	27,261us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember	27,030us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Certificates of Deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-Term	496us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember	496us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember
Long-Term	$ 1,225us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember	$ 1,225us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

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

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X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, not expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

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

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