Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Mar. 03, 2015	Jan. 07, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Discontinued Operations [Line Items]
Sale of disposal group	$ 275,000	$ 275,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax			$ 48,200	$ 56,800
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Tax Benefit			21,600	8,600
Assets held for sale			17,672	304,605
West Business Solutions [Member]
Schedule Of Discontinued Operations [Line Items]
Corporate overhead expenses				$ 18,700	$ 17,800
Purchase Agreement [Member]
Schedule Of Discontinued Operations [Line Items]
Discontinued operations, indemnification liability for breaches of representations and warranties			$ 13,750