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Investments - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | $ 6,035 us-gaap_HeldToMaturitySecuritiesCurrent | $ 6,457 us-gaap_HeldToMaturitySecuritiesCurrent
Long-Term | 64,082 us-gaap_HeldToMaturitySecuritiesNoncurrent | 57,511 us-gaap_HeldToMaturitySecuritiesNoncurrent
Municipal Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 5,539 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 5,492 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Long-Term | 35,827 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 34,495 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Federal Home Loan Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Long-Term | 27,030 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 22,520 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Certificates of Deposit [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Short-Term | 496 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember | 965 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember
Long-Term | $ 1,225 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember | $ 496 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_CertificatesOfDepositMember

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- 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 + Details
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- 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 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 + Details
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