Income Taxes (Narrative) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued [Abstract]
Effective tax rate	(1.30%)	(29.20%)	(14.40%)	(14.90%)