Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Cash Flow Information:
Cash payments (refunds) for income taxes, net	$ (6,895)	$ 9,715
Noncash investing and financing activities:
Accounts payable and long-term debt associated with additions of property, plant and equipment	$ 13,061	$ 20,510