Amortization of Definite-Lived Intangible Assets Acquired in Cmp Acquisition, in Relation to Expected Economic Benefits of Such Assets (Detail) (CMP Acquisition, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
CMP Acquisition
Component of Operating Other Cost and Expense [Line Items]
Estimated Useful Life in Years	6 years
Fair Value	$ 94,422