Segment and Geographic Information - Schedule of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands (Detail) (USD $)
In Thousands, unless otherwise specified

Segment and Geographic Information - Schedule of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 436,261us-gaap_SalesRevenueGoodsNet	$ 465,092us-gaap_SalesRevenueGoodsNet	$ 445,341us-gaap_SalesRevenueGoodsNet	$ 455,721us-gaap_SalesRevenueGoodsNet	$ 434,811us-gaap_SalesRevenueGoodsNet	$ 456,648us-gaap_SalesRevenueGoodsNet	$ 425,967us-gaap_SalesRevenueGoodsNet	$ 405,189us-gaap_SalesRevenueGoodsNet	$ 1,802,415us-gaap_SalesRevenueGoodsNet	$ 1,722,615us-gaap_SalesRevenueGoodsNet	$ 1,577,788us-gaap_SalesRevenueGoodsNet
Plant, Equipment and Timberlands - Net	697,608us-gaap_PropertyPlantAndEquipmentNet				723,340us-gaap_PropertyPlantAndEquipmentNet				697,608us-gaap_PropertyPlantAndEquipmentNet	723,340us-gaap_PropertyPlantAndEquipmentNet	621,200us-gaap_PropertyPlantAndEquipmentNet
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,802,415	1,722,615	1,577,788
Plant, Equipment and Timberlands - Net	697,608				723,340				697,608	723,340	621,186
Operating Segments [Member] \| United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									980,933	968,833	952,195
Plant, Equipment and Timberlands - Net	256,251				248,306				256,251	248,306	248,185
Operating Segments [Member] \| Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									529,003	483,859	358,442
Plant, Equipment and Timberlands - Net	257,311				287,880				257,311	287,880	191,559
Operating Segments [Member] \| United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									103,219	107,082	119,092
Plant, Equipment and Timberlands - Net	62,617				63,650				62,617	63,650	59,131
Operating Segments [Member] \| Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									129,401	113,414	106,702
Plant, Equipment and Timberlands - Net	82,774				83,033				82,774	83,033	83,796
Operating Segments [Member] \| Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									59,859	49,427	41,357
Plant, Equipment and Timberlands - Net	$ 38,655				$ 40,471				$ 38,655	$ 40,471	$ 38,515