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Capital Structure - Summary of Authorized and Issued Share Capital (Phantom) (Detail) - $ / shares	Dec. 31, 2017	Jul. 03, 2017	Dec. 31, 2016
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]
Preference shares, par value			$ 0.0015144558
Redemption price per share		$ 25	$ 25
Preference shares, rate			7.401%
7.250% Preference Shares
Class of Stock [Line Items]
Preference shares, par value			$ 0.0015144558
Redemption price per share			$ 25
Preference shares, rate			7.25%
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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