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Capital Structure - Summary of Authorized and Issued Share Capital (Phantom) (Detail) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Jul. 03, 2017
Class of Stock [Line Items]
Ordinary shares, par value	$ 0.0015144558	$ 0.0015144558
Non-voting shares, par value	0.0015144558	0.0015144558
Preference shares, par value	0.0015144558	0.0015144558
Redemption price per share	25	25
5.950% Preference Shares
Class of Stock [Line Items]
Preference shares, par value	0.0015144558	0.0015144558
Redemption price per share	$ 25	$ 25
Preference shares, rate	5.95%	5.95%
7.401% Preference Shares
Class of Stock [Line Items]
Redemption price per share			$ 25
5.625% Preference Shares
Class of Stock [Line Items]
Preference shares, par value	$ 0.0015144558	$ 0.0015144558
Redemption price per share	$ 25	$ 25
Preference shares, rate	5.625%	5.625%

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