Changes in Accumulated Income Loss by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	$ 10,133	$ (8,038)	$ 9,568	$ (406)
Other comprehensive income (loss) before reclassifications	(541)	1,739	(72)	(6,683)
Income tax	0	(56)	0	539
Other comprehensive income (loss) before reclassifications, net of tax	(541)	1,683	(72)	(6,144)
Amounts reclassified from accumulated other comprehensive income (loss)	180	321	365	642
Income tax	(82)	(124)	(171)	(250)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	98	197	194	392
Total other comprehensive income (loss), net of tax	(443)	1,880	122	(5,752)
Accumulated other comprehensive income (loss),Ending Balance	9,690	(6,158)	9,690	(6,158)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	(6,372)	(10,110)	(6,479)	(10,318)
Other comprehensive income (loss) before reclassifications			0	0
Income tax			0	0
Other comprehensive income (loss) before reclassifications, net of tax			0	0
Amounts reclassified from accumulated other comprehensive income (loss)	202	341	406	683
Income tax	(90)	(132)	(187)	(266)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	112	209	219	417
Total other comprehensive income (loss), net of tax	112	209	219	417
Accumulated other comprehensive income (loss),Ending Balance	(6,260)	(9,901)	(6,260)	(9,901)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	16,359	1,922	15,892	9,749
Other comprehensive income (loss) before reclassifications	(570)	1,739	(103)	(6,683)
Income tax	0	(56)	0	539
Other comprehensive income (loss) before reclassifications, net of tax	(570)	1,683	(103)	(6,144)
Total other comprehensive income (loss), net of tax	(570)	1,683	(103)	(6,144)
Accumulated other comprehensive income (loss),Ending Balance	15,789	3,605	15,789	3,605
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	146	150	155	163
Other comprehensive income (loss) before reclassifications	29	0	31	0
Other comprehensive income (loss) before reclassifications, net of tax	29	0	31	0
Amounts reclassified from accumulated other comprehensive income (loss)	(22)	(20)	(41)	(41)
Income tax	8	8	16	16
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(14)	(12)	(25)	(25)
Total other comprehensive income (loss), net of tax	15	(12)	6	(25)
Accumulated other comprehensive income (loss),Ending Balance	$ 161	$ 138	$ 161	$ 138