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Insurance Operations - Assets Held by Insurance Regulators (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Restricted Cash and Cash Equivalents [Member]    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 2,635 $ 2,635
Investments [Member]    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 3,952 $ 3,876