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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Net of Treasury stock | $ 22,370 us-gaap_TreasuryStockValue | $ 22,370 us-gaap_TreasuryStockValue
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Net of Treasury stock | $ 22,370 us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 22,370 us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |