Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 27,289	$ 27,019
OTHER COMPREHENSIVE INCOME:
Foreign currency translation adjustment	36,253	31,121
Net unrealized gain/(loss) on qualifying cash flow hedges, net of tax (provision)/benefit	506	(9,431)
Changes in pension and other postretirement benefits, net of tax (provision)/benefit	(893)	1,923
Other comprehensive income	35,866	23,613
COMPREHENSIVE INCOME	63,155	50,632
Less: Comprehensive income attributable to noncontrolling interest	13,086	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO G&W	$ 50,069	$ 50,632