Income Taxes - Variation Between Expected and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	(35.00%)
State income taxes (net of federal benefit)	2.00%	(2.80%)	(2.20%)
Acquisition costs	0.00%	0.00%	2.00%
Benefit of qualified domestic production activities	(12.80%)	(2.70%)	(0.50%)
Benefit of research and development tax credits	(59.50%)	(4.30%)	(2.60%)
Goodwill impairment	0.00%	0.00%	28.80%
Increase in valuation allowance	1.20%	9.90%	0.00%
Non deductible book expenses	2.20%	0.60%	0.20%
Recognition of deferred tax assets	11.00%	0.00%	0.00%
Reduction of state effective tax rate	0.00%	(7.00%)	0.00%
Reduction of tax reserves	0.00%	(4.00%)	0.00%
Unremitted (losses) earnings of foreign subsidiary	(0.90%)	0.80%	0.30%
Other	(0.30%)	(0.20%)	(0.10%)
Effective income tax (benefit) rate	(22.10%)	25.30%	(9.10%)