Changes in Accumulated Income Loss by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	$ (51,646)	$ 10,133	$ (24,001)	$ 9,568
Other comprehensive income (loss) before reclassifications	6,606	(541)	(21,335)	(72)
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of tax	6,606	(541)	(21,335)	(72)
Amounts reclassified from accumulated other comprehensive income (loss)	393	180	833	364
Reclassification from AOCI, Current Period, Tax	(141)	(82)	(285)	(170)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	252	98	548	194
Total other comprehensive income (loss), net of tax	6,858	(443)	(20,787)	122
Accumulated other comprehensive income (loss),Ending Balance	(44,788)	9,690	(44,788)	9,690
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	(10,065)	(6,372)	(10,323)	(6,479)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	401	202	803	405
Reclassification from AOCI, Current Period, Tax	(141)	(90)	(285)	(186)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	260	112	518	219
Total other comprehensive income (loss), net of tax	260	112	518	219
Accumulated other comprehensive income (loss),Ending Balance	(9,805)	(6,260)	(9,805)	(6,260)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	(41,588)	16,359	(13,647)	15,892
Other comprehensive income (loss) before reclassifications	6,606	(570)	(21,335)	(103)
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of tax	6,606	(570)	(21,335)	(103)
Total other comprehensive income (loss), net of tax	6,606	(570)	(21,335)	(103)
Accumulated other comprehensive income (loss),Ending Balance	(34,982)	15,789	(34,982)	15,789
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss),Beginning Balance	7	146	(31)	155
Other comprehensive income (loss) before reclassifications	0	29	0	31
Other comprehensive income (loss) before reclassifications, net of tax	0	29	0	31
Amounts reclassified from accumulated other comprehensive income (loss)	(8)	(22)	30	(41)
Reclassification from AOCI, Current Period, Tax	0	8	0	16
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(8)	(14)	30	(25)
Total other comprehensive income (loss), net of tax	(8)	15	30	6
Accumulated other comprehensive income (loss),Ending Balance	$ (1)	$ 161	$ (1)	$ 161