Tax on Income - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Foreign pre-tax income	$ 146,000,000	$ 219,000,000	$ 213,000,000
Increase (decrease) in valuation allowance	6,600,000	6,100,000	1,200,000
Deferred tax (benefit) charge related to profits that were not permanently reinvested	(42,800,000)	1,400,000	2,200,000
Unrecognized tax benefits that would impact the effective tax rate if recognized	151,000,000
Indemnification for gross unrecognized tax benefits from sellers of acquired companies	4,700,000
Tax related interest expense	1,800,000	1,700,000	2,700,000
Liability for tax-related interest expense	10,300,000	8,600,000
Unrecognized Consolidated Financial Statements
Income Taxes [Line Items]
Net operating profits	123,000,000
Scenario, Adjustment
Income Taxes [Line Items]
Other		(41,900,000)
Windfall Tax Benefits Recognized
Income Taxes [Line Items]
Windfall tax benefits	38,000,000	11,600,000	41,800,000
Domestic
Income Taxes [Line Items]
Net operating losses	580,000,000
Domestic | Subject To Section 382 Limitations
Income Taxes [Line Items]
Net operating losses	470,000,000
International
Income Taxes [Line Items]
Net operating losses	145,000,000
Undistributed earnings	1,200,000,000
International | Expires 2014 [Member]
Income Taxes [Line Items]
Net operating losses	1,000,000
International | Expire Subsequent To Twenty Fourteen
Income Taxes [Line Items]
Net operating losses	59,000,000
International | Unlimited Life
Income Taxes [Line Items]
Net operating losses	$ 85,000,000