Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate (Detail)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Federal statutory income tax rate	[1]	20.30%	21.00%	7.80%
Tax effect of international operations	[2]	(74.50%)	(4.90%)	10.40%
Change in valuation allowances		81.60%	3.40%	5.70%
Withholding taxes		7.30%	2.30%	1.10%
Interest limitations		8.80%	0.80%	0.50%
Non-deductible transaction costs		3.40%	0.00%	0.00%
Non-deductible goodwill impairment		140.80%	0.00%	0.00%
Effective tax rate		187.70%	22.60%	25.50%

[1] The statutory rate for 2015 and 2014 reflects the U.K. statutory rate of 20.25 percent and 21 percent, respectively. For 2013, the statutory rate reflects the Swiss statutory rate of 7.8 percent.

[2] The tax effect of international operations for 2015 and 2014 consists of non-U.K. jurisdictions. For 2013, the tax effect of international operations consists of non-Swiss jurisdictions.