Share Capital - Additional Information (Detail)		12 Months Ended
	Jun. 10, 2014 $ / shares shares	Dec. 31, 2015 vote $ / shares shares	Dec. 31, 2014 $ / shares shares
Class of Stock [Line Items]
Common shares, authorized (shares)		156,000,000	156,000,000
Common shares, par value (dollars per share) | $ / shares		$ 1	$ 1
Preference shares, authorized (shares)		45,000,000	45,000,000
Preference shares, par value (dollars per share) | $ / shares		$ 1.00	$ 1.00
Common stock, conversion basis, number of votes | vote		1
Preferred shares issued (shares)		0
Minimum
Class of Stock [Line Items]
Voting power of ordinary shares, percentage (or more)		9.50%
Voting Ordinary Shares and Non-Voting Ordinary Shares
Class of Stock [Line Items]
Common shares, authorized (shares)		111,000,000	111,000,000
Common shares, par value (dollars per share) | $ / shares		$ 1	$ 1
Series B Non-Voting Convertible Ordinary Shares | Goldman Sachs
Class of Stock [Line Items]
Ordinary shares, shares issued (shares)		0
Ordinary shares, shares outstanding (shares)		0
Series B Non-Voting Convertible Ordinary Shares | StarStone
Class of Stock [Line Items]
Conversion of stock, shares converted	714,015
Series D Non-Voting Convertible Ordinary Shares | Goldman Sachs
Class of Stock [Line Items]
Ordinary shares, shares issued (shares)		0
Ordinary shares, shares outstanding (shares)		0
Series E Non-Voting Ordinary Shares
Class of Stock [Line Items]
Preferred shares issued (shares)		404,771
Preferred stock, shares outstanding (shares)		404,771
Conversion of stock, shares converted		309,244
Series E Non-Voting Ordinary Shares | StarStone
Class of Stock [Line Items]
Preferred shares issued (shares)	714,015
Series C Preferred Stock
Class of Stock [Line Items]
Stock split, conversion ratio		1
Aggregate voting power of Company's issued share capital (percent) (not to exceed)		0.01%
Share Capital Series B Convertible Participating Non-Voting Perpetual Preferred Stock | StarStone
Class of Stock [Line Items]
Preference shares, par value (dollars per share) | $ / shares	$ 1.00
Share Capital - Ordinary Shares | Series C Non-Voting Ordinary
Class of Stock [Line Items]
Class of warrant, outstanding (shares)		340,820
Class of Warrant, exercise price (dollars per share) | $ / shares		$ 115.00