Reclassification of Pension and Post-retirement Benefit Plan Out of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (72,780)	$ (127,817)	$ (77,080)	$ (132,031)
Amortization of prior service cost	(63)	(80)	(189)	(240)
Recognized net actuarial losses	2,286	3,462	9,146	10,392
Tax benefit	(805)	(1,275)	(3,239)	(3,831)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	1,418	2,107	5,718	6,321
Balance at end of period	(71,362)	(125,710)	(71,362)	(125,710)
Balance at beginning of period	(1,951)	(7,346)	(1,189)	4,959
Foreign currency translation adjustments, parent	(20,283)	6,154	(21,045)	(6,151)
Balance at end of period	(22,234)	(1,192)	(22,234)	(1,192)
Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,744)	(1,390)	(1,602)	(469)
Foreign currency translation adjustments, noncontrolling interest	(280)	4	(422)	(917)
Balance at end of period	$ (2,024)	$ (1,386)	$ (2,024)	$ (1,386)