XML 58 R44.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Statutory Balances and Accounting Practices (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Statutory Balances And Accounting Practices [Abstract] |
Schedule Of Statutory Net Income And Capital And Surplus | The following table presents the statutory net income, and statutory capital and surplus of the Insurance Companies, as reported to regulatory authorities:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (Amounts in thousands)
Statutory net income(1) | $ | 117,376 |  |  | $ | 82,359 |  |  | $ | 123,984 |
Statutory capital and surplus | $ | 1,589,226 |  |  | $ | 1,441,571 |  |  | $ | 1,451,950 |
__________
(1) | Statutory net income reflects differences from GAAP net income, including changes in the fair value of the investment portfolio as a result of the application of the fair value option.

X
- Definition Schedule Of Statutory Net Income And Capital And Surplus [Table Text Block]. + References No definition available. + Details
Name: | mcy_ScheduleOfStatutoryNetIncomeAndCapitalAndSurplusTableTextBlock
Namespace Prefix: | mcy_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Statutory Balances And Accounting Practices [Abstract] + References No definition available. + Details
Name: | mcy_StatutoryBalancesAndAccountingPracticesAbstract
Namespace Prefix: | mcy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration