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Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Statutory income tax rate 21.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate [1] 7.80%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate [1] 7.80%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate [1]
UNITED KINGDOM      
Income Taxes [Line Items]      
Statutory income tax rate 21.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_GB		    
SWITZERLAND      
Income Taxes [Line Items]      
Statutory income tax rate   7.80%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_CH		 7.80%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_CH
[1] The statutory rate for 2014 reflects the U.K. statutory rate of 21 percent. For 2013 and 2012, the statutory rate reflects the Swiss statutory rate of 7.8 percent.