Supplemental Cash Flow Disclosures - Cash Paid for Interest and Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information [Line Items]
Cash paid for interest	$ 8,086	$ 7,746	$ 8,134
Cash paid for income taxes	$ 3,809	$ 2,327	$ 10,168