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Employee Benefit Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Person shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Minimum employment period for benefits | 30 days |  |  |  |  |
Employee Stock Ownership Plan Shares held | 24,600,000 |  |  |  |  |
Postemployment benefits liability | $ | $ 19.5 | $ 21.7 |  |  |  |
Compensation, Percentage | 100.00% |  |  |  |  |
Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Aggregate fair value of the restricted equity awards that vested during the period | $ | $ 130.5 | 77.0 | $ 105.4 |  |  |
Non Employee Director Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Vesting period of grants to date | 11 months |  |  |  |  |
Total pretax intrinsic value of options exercised and restricted stock vested | $ | $ 2.2 | $ 3.0 | $ 2.2 |  |  |
Executive Deferred Compensation Plan |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Common shares reserved for issuance under executive deferred compensation plan | 11,100,000 |  |  |  |  |
2010 Equity Incentive Plan | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Shares authorized | 18,000,000.0 |  |  |  |  |
2015 Equity Incentive Plan | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Shares authorized | 13,000,000.0 |  |  |  |  |
2003 Directors Equity Incentive Plan | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Shares authorized | 0 |  |  |  |  |
2003 Directors Equity Incentive Plan | Non Employee Director Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Shares authorized | 0 |  |  |  |  |
2017 Directors Equity Incentive Plan | Non Employee Director Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Shares authorized | 500,000 |  |  |  |  |
Performance Based Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Estimated Number Of Participants | Person | 45 |  |  |  |  |
Performance Based Restricted Equity Awards | Insurance Operating Results | Lower Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00%
Performance Based Restricted Equity Awards | Insurance Operating Results | Upper Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 250.00% | 250.00% | 250.00% | 250.00% | 250.00% | 200.00%
Performance Based Restricted Equity Awards | Investment Results | Lower Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00%
Performance Based Restricted Equity Awards | Investment Results | Upper Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 200.00% | 200.00% | 200.00% | 200.00% | 200.00% | 200.00%
Performance Based Restricted Equity Awards | Growth in percentage of auto policies bundled with other specified types of policies [Member] | Lower Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount |  |  | 100.00% |  |  |
Performance Based Restricted Equity Awards | Growth in percentage of auto policies bundled with other specified types of policies [Member] | Upper Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount |  |  | 200.00% |  |  |
Performance Based Restricted Equity Awards | Growth in percentage of auto policies bundled with other specified types of policies, performance objective not achieved |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount |  |  | 0.00% |  |  |
Performance Based Restricted Equity Awards | Unit growth in a particular customer segment [Member] | Lower Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 85.00% | 85.00% |  |  |  |
Performance Based Restricted Equity Awards | Unit growth in a particular customer segment [Member] | Upper Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 150.00% | 150.00% |  |  |  |
Performance Based Restricted Equity Awards | Unit growth in a particular customer segment, performance objective not achieved |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Performance-based awards granted vesting percentage of the award amount | 0.00% | 0.00% |  |  |  |
Defined Contribution Pension Plan 401k |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Matching contributions | $ | $ 97.3 | $ 86.8 | $ 79.1 |  |  |
Defined Contribution Pension Plan 401k | Upper Limit |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Matching contribution to defined contribution pension plan | 6.00% |  |  |  |  |
Vesting tranche one | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Vesting period of grants to date | 3 years |  |  |  |  |
Vesting tranche two | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Vesting period of grants to date | 4 years |  |  |  |  |
Vesting tranche three | Employee Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Vesting period of grants to date | 5 years |  |  |  |  |
Cash [Member] |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Compensation, Percentage | 40.00% |  |  |  |  |
Non Employee Director Restricted Equity Awards |  |  |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |  |  |
Compensation, Percentage | 60.00% |  |  |  |  |

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