Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Y	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Statutory U.S. federal income tax rate	35.00%
Deferred tax assets, valuation allowance	$ 31.1	$ 26.5
State net operating loss carryforwards	34.4
Foreign net operating loss carryforwards	75.3
Net operating loss carryforwards, beginning expiration year	2014
Research and development credit carry forward	7.3	18.8
Research and development credit carry forward, beginning expiration year	2014
Research and development credit carry forward, ending expiration year	2028
Earnings from foreign subsidiaries that residual U.S. income taxes is not provided	800
Cumulative unrealized tax deductions related to stock option exercises and vested restricted shares	21.6
Realized tax deductions related to stock option exercises and vested restricted shares	8.3
Gross uncertain tax position	47.5	34.6	21.7	21.5
Liability for unrecognized tax benefits that would affect effective tax rate, if recognized	45.0
Number of tax years the company is currently open to audit by tax authorities	7
Minimum
Income Taxes [Line Items]
Liability for unrecognized tax benefits for interest and penalties	$ 2.0	$ 2.0