Income Taxes (Reconciliation of the Difference between the Actual Provisions for Income Taxes) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes	2.90%	0.80%	2.90%
Valuation allowances for deferred tax assets, including state	1.30%	1.30%	(1.80%)
Research and development credits	(1.50%)	(0.50%)	(1.10%)
Capitalized transaction costs	0.00%	2.00%	0.00%
Domestic production activities deduction	(1.60%)	(2.60%)	(2.70%)
Foreign income taxed at lower rates	(1.30%)	(3.50%)	0.00%
Other	0.10%	2.60%	0.10%
Effective income tax rate	34.90%	35.10%	32.40%