| Component: (Network and Table) | |
|---|---|
| Network | 101160 - Disclosure - Share-based Compensation - Summary of Restricted Share Activity (Detail) (http://www.argolimited.com/20161231/taxonomy/role/DisclosureShareBasedCompensationSummaryOfRestrictedShareActivityDetail) |
| Table | Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |
| Reporting Entity [Axis] | 0001091748 (http://www.sec.gov/CIK) |
| Award Type | Restricted Stock Units (RSUs) [Member] |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Period [Axis] |
|---|---|
2016-01-01 - 2016-12-31 | |
Shares, Outstanding at January 1, 2016 | 514,742 |
Granted, Shares | |
Vested and issued, Shares | ( |
Expired or forfeited, Shares | ( |
Shares, Outstanding at December 31, 2016 | 702,030 |
Weighted-Average Grant Date Fair Value, Outstanding at January 1, 2016 | |
Granted, Weighted-Average Grant Date Fair Value | |
Vested and issued, Weighted-Average Grant Date Fair Value | |
Expired or forfeited, Weighted-Average Grant Date Fair Value | |
Weighted-Average Grant Date Fair Value, Outstanding at December 31, 2016 |