Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (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 [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	$ (108,375)	$ (28,998)	$ (83,945)	$ (29,528)
Other comprehensive income before reclassifications	5,956	3,742	(19,224)	3,859
Amounts reclassified from AOCI	750	411	1,500	824
Net current-period other comprehensive income	6,706	4,153	(17,724)	4,683
Accumulated Other Comprehensive Income (Loss), ending balance	(101,669)	(24,845)	(101,669)	(24,845)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(68,051)	(10,854)	(42,914)	(10,971)
Other comprehensive income before reclassifications	5,940	3,742	(19,197)	3,859
Net current-period other comprehensive income	5,940	3,742	(19,197)	3,859
Accumulated Other Comprehensive Income (Loss), ending balance	(62,111)	(7,112)	(62,111)	(7,112)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	(40,400)	(18,262)	(41,149)	(18,672)
Amounts reclassified from AOCI	750	410	1,499	820
Net current-period other comprehensive income	750	410	1,499	820
Accumulated Other Comprehensive Income (Loss), ending balance	(39,650)	(17,852)	(39,650)	(17,852)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), beginning balance	76	118	118	115
Other comprehensive income before reclassifications	16		(27)
Amounts reclassified from AOCI		1	1	4
Net current-period other comprehensive income	16	1	(26)	4
Accumulated Other Comprehensive Income (Loss), ending balance	$ 92	$ 119	$ 92	$ 119

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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