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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 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 668,868 | $ 653,715
Gross Unrealized Gains | 773 | 1,579
Gross Unrealized Losses | (12,879) | (5,960)
Fair Value | 656,762 | 649,334
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost |  | 10,000
Fair Value |  | 10,000
U.S. Government Obligations and Agencies [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 59,086 | 60,481
Gross Unrealized Losses | (1,374) | (877)
Fair Value | 57,712 | 59,604
Corporate Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 339,730 | 228,336
Gross Unrealized Gains | 424 | 476
Gross Unrealized Losses | (6,190) | (1,308)
Fair Value | 333,964 | 227,504
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 242,492 | 221,956
Fair Value | 237,432 | 219,452
Mortgage-Backed and Asset-Backed Securities [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 242,492 | 221,956
Gross Unrealized Gains | 31 | 19
Gross Unrealized Losses | (5,091) | (2,523)
Fair Value | 237,432 | 219,452
Municipal Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 15,798 | 120,883
Gross Unrealized Gains |  | 599
Gross Unrealized Losses | (81) | (1,187)
Fair Value | 15,717 | 120,295
Redeemable Preferred Stock [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 11,762 | 12,059
Gross Unrealized Gains | 318 | 485
Gross Unrealized Losses | (143) | (65)
Fair Value | $ 11,937 | $ 12,479

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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 investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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