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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 105,886 | $ 60,202
Total fixed-maturity securities, Gross Unrealized Gains | 149 | 590
Total fixed-maturity securities, Gross Unrealized Losses | (30) | (151)
Total fixed-maturity securities, Estimated Fair Value | 106,005 | 60,641
Unrestricted Fixed-Maturity Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 73,834 | 7,895
Total fixed-maturity securities, Gross Unrealized Gains | 33 | 179
Total fixed-maturity securities, Gross Unrealized Losses | (2) | (11)
Total fixed-maturity securities, Estimated Fair Value | 73,865 | 8,063
Fixed-Maturity Securities Held in Trust [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 32,052 | 52,307
Total fixed-maturity securities, Gross Unrealized Gains | 116 | 411
Total fixed-maturity securities, Gross Unrealized Losses | (28) | (140)
Total fixed-maturity securities, Estimated Fair Value | 32,140 | 52,578
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 74,364 | 6,491
Total fixed-maturity securities, Gross Unrealized Gains | 19 | 12
Total fixed-maturity securities, Gross Unrealized Losses | (3) | (28)
Total fixed-maturity securities, Estimated Fair Value | 74,380 | 6,475
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 21,493 | 41,018
Total fixed-maturity securities, Gross Unrealized Gains | 108 | 531
Total fixed-maturity securities, Gross Unrealized Losses | (12) | (65)
Total fixed-maturity securities, Estimated Fair Value | 21,589 | 41,484
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 10,029 | 12,693
Total fixed-maturity securities, Gross Unrealized Gains | 22 | 47
Total fixed-maturity securities, Gross Unrealized Losses | (15) | (58)
Total fixed-maturity securities, Estimated Fair Value | $ 10,036 | $ 12,682

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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=49167202&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=49167202&loc=d3e26610-111562 + Details
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