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Outstanding Debt Consisted (Parenthetical) (Detail) - 7.75% Subordinated Notes due 2045 | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Subordinated Notes percentage | 7.75% | 7.75%
Subordinated Notes due date | 2045 | 2045

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- Definition Debt Instrument Maturity Date Year + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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