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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Tax at statutory federal rate | 35.00% | 35.00% | 35.00%
Tax cuts and jobs act, reduction in income tax expense related to revaluing deferred tax assets and liabilities | $ 99,500,000 |  |
Federal tax benefits resulting from investments in renewable energy tax credit funds | 52,400,000 | $ 62,200,000 | $ 1,900,000
Tax cuts and jobs act, provisional tax amount related to deductibility of executive compensation expense | 4,500,000 |  |
Deferred tax assets valuation allowance | 0 | 0 |
Net taxes payable | 23,800,000 | 41,200,000 |
Provision for income taxes | 540,800,000 | 413,500,000 | 611,100,000
Interest and Penalties [Member] |  |  |
Income Taxes [Line Items] |  |  |
Provision for income taxes | $ 200,000 | $ 100,000 | $ 100,000
ARX and subsidiaries |  |  |
Income Taxes [Line Items] |  |  |
Noncontrolling interest, ownership percentage (less than) | 80.00% |  |
Net unrealized gains (losses) on securities |  |  |
Income Taxes [Line Items] |  |  |
Tax cuts and jobs act, reduction in income tax expense related to revaluing deferred tax liability associated with net unrealized gains on investment portfolio | $ 275,700,000 |  |
Other Deferred Tax Assets and Liabilities [Member] |  |  |
Income Taxes [Line Items] |  |  |
Tax cuts and jobs act, reduction in income tax expense related to other deferred tax assets (liabilities) | $ 176,200,000 |  |
Tax Year 2018 |  |  |
Income Taxes [Line Items] |  |  |
Tax at statutory federal rate | 21.00% |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: 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(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(15)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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