Income Taxes (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	24.20%	42.20%	30.10%	37.60%
U.S. federal statutory income tax rate			35.00%	35.00%
Anticipated reductions to unrecognized tax benefits within next twelve months	$ 0		$ 0
Income Tax Examination, Penalties and Interest Accrued	$ 0		$ 0