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Share-Based Compensation Plans - Additional Information (Detail) - $ / shares		3 Months Ended		9 Months Ended
	Jun. 11, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Time Based Option Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded		0	0	200,000	25,000
Unvested stock options forfeited		0	75,000		75,000
Strike price per share				$ 28.37	$ 24.00
Percentage of shares vested on each anniversary of the grant date				33.33%
Time-based options vesting date					2017-02
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued		0	0
Restricted Stock | Key Employee | Stock vest first anniversary of the grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				16.50%	16.50%
Vesting period				1 year	1 year
Restricted Stock | Key Employee | Stock vest second anniversary of the grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				16.50%	16.50%
Vesting period				2 years	2 years
Restricted Stock | Key Employee | Stock vest third anniversary of the grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				17.00%	17.00%
Vesting period				3 years	3 years
Restricted Stock | Key Employee | Vesting Schedule Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				100.00%	100.00%
Vesting period				3 years	3 years
Percentage of stock award subject to vesting				50.00%	50.00%
Restricted Stock | Key Employee | Time Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued				83,875	78,166
Restricted Stock | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				33.33%	33.33%
Number of shares issued				10,574	11,857
Vesting period				3 years	3 years
Restricted Stock | Chief Executive Officer And Other Key Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date				100.00%
Number of shares issued				44,058
Vesting date				Jan. 01, 2018
Ordinary Shares A | Key Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued				138,507	95,694
Weighted average grant date value of shares granted				$ 28.37	$ 25.37
Ordinary Shares A | Key Employee | First Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					33.33%
Number of shares issued					5,671
Vesting period					3 years
Ordinary Shares A | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date value of shares granted		$ 26.17	$ 25.23	$ 27.31	$ 25.84
Number of shares earned not granted		9,392	9,498	27,437	27,676
Ordinary Shares A | Non Employee Director | Revised Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued	18,838

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