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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) LegalMatter CompensationPlan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of pending legal proceedings that would have an effect on consolidated financial position, results of operations, or cash flows | LegalMatter | 0 |  |
Total cash compensation under Deferred Compensation Plans | 5.00% | 5.00% | 5.00%
Percentage of fixed return from Deferred Compensation Plans to participants | 5.00% | 5.45% | 5.60%
Deferred Compensation Plans |  |  |
Loss Contingencies [Line Items] |  |  |
Employer discretionary matching contribution equal to employee's contribution | 100.00% | 100.00% | 100.00%
Number of qualified deferred compensation plans | CompensationPlan | 2 |  |
Time period when distributions are paid, minimum years subsequent to the date an individual becomes a participant in the Plan | 5 years |  |
Distributions to senior executives commencement period, days after participant's separation from service | 60 days |  |
Distributions to senior executives commencement period following individual attains age sixty five | 15 days |  |
Matching contributions as general and administrative expense associated with the Deferred Compensation Plans | $ 0.1 | $ 0.2 | $ 0.3
Deferred Compensation Plans assets | 13.5 | 13.1 |
Deferred Compensation Plans liability | $ 11.0 | $ 10.6 |
Deferred Compensation Plans | Executive Officer |  |  |
Loss Contingencies [Line Items] |  |  |
Contribution as percentage of salary | 50.00% |  |
Contribution as percentage of cash bonus | 100.00% |  |
Deferred Compensation Plans | Non Employee Directors |  |  |
Loss Contingencies [Line Items] |  |  |
Contribution as percentage of retainer and meeting fees | 100.00% |  |
Deferred Compensation Plans | After two years of service |  |  |
Loss Contingencies [Line Items] |  |  |
Vested percentage of employer contributions and investment earnings or losses | 20.00% |  |
Deferred Compensation Plans | After three years of service |  |  |
Loss Contingencies [Line Items] |  |  |
Vested percentage of employer contributions and investment earnings or losses | 40.00% |  |
Deferred Compensation Plans | After four years of service |  |  |
Loss Contingencies [Line Items] |  |  |
Vested percentage of employer contributions and investment earnings or losses | 80.00% |  |
Deferred Compensation Plans | After five or more years of service |  |  |
Loss Contingencies [Line Items] |  |  |
Vested percentage of employer contributions and investment earnings or losses | 100.00% |  |
401(k) Savings and Retirement Plan (the "Plan") |  |  |
Loss Contingencies [Line Items] |  |  |
Minimum qualified service required to participate in the Savings and Retirement Plan, years | 1 year |  |
Eligible employee contribution on eligible compensation | 90.00% |  |
Employer discretionary matching contribution equal to employee's contribution | 100.00% | 100.00% | 100.00%
Maximum percentage of employer discretionary matching contribution of employee's eligible compensation | 5.00% | 5.00% | 5.00%
Minimum number of hours of employment in the plan year for discretionary matching contribution | One thousand |  |
Discretionary contributions to the plan, net of forfeitures | $ 12.3 | $ 12.0 | $ 12.0
401(k) Savings and Retirement Plan (the "Plan") | Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Age limit for participating in the Savings and Retirement Plan, years | 18 years |  |

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