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Tax Effects of Temporary Differences That Give Rise to Significant Portions of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Discounted unpaid losses and loss adjustment expenses | $ 8,351 | $ 7,492
Unearned premiums | 8,061 | 3,409
Alternative minimum tax credit carryover | 10,473 | 10,473
Partnership K1 basis differences | 145 | 145
Capital gain on derivative instruments | 4,130 | 4,786
Investment impairments | 1,097 | 379
Stock options | 2,306 | 2,048
Deferred acquisition costs | 1,606 | 187
Stat-to-GAAP reinsurance reserve | 1,424 | 1,424
Intercompany transfers | 1,807 | 1,919
Other | 4,082 | 3,050
Total deferred tax assets | 43,482 | 35,312
Deferred tax liabilities: |  |
Intangible assets | 6,218 | 3,220
Unrealized gain on securities available-for-sale and investments in limited partnerships included in accumulated other comprehensive income | 8,390 | 10,263
Investment basis differences | 979 | 692
Depreciation and amortization | 129 | 16
Other | 882 | 871
Total deferred tax liabilities | 16,598 | 15,062
Total net deferred tax assets | $ 26,884 | $ 20,250

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