Income Taxes - Reconciliation of Tax Provision for Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax provision at U.S. statutory rate	35.00%	35.00%	35.00%
Valuation allowance on deferred tax assets	8.60%	(191.10%)	27.70%
Tax exempt interest	(10.30%)	(17.50%)	(19.70%)
Tax on undistributed foreign earnings	(8.10%)	6.10%	1.30%
Foreign tax rate differential	(6.20%)	(4.80%)	(3.00%)
Audit settlements & unrecognized tax benefits	0.90%	3.80%	(13.20%)
U.S. permanent items	(1.00%)	(1.30%)	0.50%
U.S. tax on foreign earnings	9.30%	(0.70%)	0.50%
Other adjustments	(1.30%)	(0.60%)	(3.90%)
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount	(1.30%)	(1.00%)	0.00%
State and local income tax	1.60%	0.60%	1.40%
Effective income tax rate	27.20%	(171.50%)	26.60%