Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |
Jan. 01, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Minimum | ||
| Significant Accounting Policies [Line Items] | ||
| Traditional life products, life reserve interest assumptions range, maximum | 2.30% | |
| Maximum | ||
| Significant Accounting Policies [Line Items] | ||
| Traditional life products, life reserve interest assumptions range, maximum | 6.00% | |
| Accounting Standards Update 2018-02 | Subsequent Event | ||
| Significant Accounting Policies [Line Items] | ||
| Reclassification from AOCI to retained earning tax effect | $ (2,279) | |
| Increase to AOCI | $ 2,279 | |
| Long Term Care | Minimum | ||
| Significant Accounting Policies [Line Items] | ||
| Traditional life products, life reserve interest assumptions range, maximum | 5.00% | |
| Long Term Care | Maximum | ||
| Significant Accounting Policies [Line Items] | ||
| Traditional life products, life reserve interest assumptions range, maximum | 6.00% |