Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 28,357	$ 26,216	$ 44,246	$ 45,171
Effective income tax rate	35.70%	33.10%	35.80%	33.20%
Unrecognized tax benefits	$ 21,700		$ 21,700		$ 20,600
Unrecognized tax benefits reductions resulting from settlements with taxing authorities and lapse of applicable statute of limitations	$ 3,800		$ 3,800