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Investments - Cost or Amortized Cost and Fair Value of Debt and Short-term Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | $ 773,493 |
Available-for-sale debt securities | 760,408 | $ 639,334
Total Cost or Amortized Cost | 773,493 | 653,715
Total Gross Unrealized Gains | 776 | 1,579
Total Gross Unrealized Losses | (13,861) | (5,960)
Total Fair Value | 760,408 | 649,334
Short-term investments, Cost or Amortized Cost |  | 10,000
Short-term investments, Fair Value |  | 10,000
U.S. Government Obligations and Agencies [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | 67,442 | 60,481
Debt Securities, Gross Unrealized Gains | 15 |
Debt Securities, Gross Unrealized Losses | (1,459) | (877)
Available-for-sale debt securities | 65,998 | 59,604
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | 415,600 | 228,336
Debt Securities, Gross Unrealized Gains | 532 | 476
Debt Securities, Gross Unrealized Losses | (6,165) | (1,308)
Available-for-sale debt securities | 409,967 | 227,504
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | 275,128 | 221,956
Debt Securities, Gross Unrealized Gains | 23 | 19
Debt Securities, Gross Unrealized Losses | (5,923) | (2,523)
Available-for-sale debt securities | 269,228 | 219,452
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | 3,401 | 120,883
Debt Securities, Gross Unrealized Gains |  | 599
Debt Securities, Gross Unrealized Losses | (123) | (1,187)
Available-for-sale debt securities | 3,278 | 120,295
Redeemable Preferred Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Cost or Amortized Cost | 11,922 | 12,059
Debt Securities, Gross Unrealized Gains | 206 | 485
Debt Securities, Gross Unrealized Losses | (191) | (65)
Available-for-sale debt securities | $ 11,937 | $ 12,479

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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