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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Estimated Fair Values of Fixed-Maturity Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 76,912 | $ 99,088
Total fixed-maturity securities, Gross Unrealized Gains | 15 | 78
Total fixed-maturity securities, Gross Unrealized Losses | (96) | (111)
Total fixed-maturity securities, Estimated Fair Value | 76,831 | 99,055
Unrestricted Fixed-Maturity Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 47,635 | 66,481
Total fixed-maturity securities, Gross Unrealized Gains |  | 14
Total fixed-maturity securities, Gross Unrealized Losses | (10) | (11)
Total fixed-maturity securities, Estimated Fair Value | 47,625 | 66,484
Fixed-Maturity Securities Held in Trust [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 29,277 | 32,607
Total fixed-maturity securities, Gross Unrealized Gains | 15 | 64
Total fixed-maturity securities, Gross Unrealized Losses | (86) | (100)
Total fixed-maturity securities, Estimated Fair Value | 29,206 | 32,571
U.S. Government Treasury Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 249 | 249
Total fixed-maturity securities, Gross Unrealized Losses |  | (1)
Total fixed-maturity securities, Estimated Fair Value | 249 | 248
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 59,450 | 69,392
Total fixed-maturity securities, Gross Unrealized Gains | 1 | 13
Total fixed-maturity securities, Gross Unrealized Losses | (80) | (23)
Total fixed-maturity securities, Estimated Fair Value | 59,371 | 69,382
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 11,415 | 21,048
Total fixed-maturity securities, Gross Unrealized Gains | 9 | 62
Total fixed-maturity securities, Gross Unrealized Losses | (9) | (49)
Total fixed-maturity securities, Estimated Fair Value | 11,415 | 21,061
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 5,798 | 8,399
Total fixed-maturity securities, Gross Unrealized Gains | 5 | 3
Total fixed-maturity securities, Gross Unrealized Losses | (7) | (38)
Total fixed-maturity securities, Estimated Fair Value | $ 5,796 | $ 8,364

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- Definition Amount of investments in debt securities classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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