Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended					1 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 2.58% Senior Euro Notes	Dec. 31, 2012 Senior Notes	Dec. 31, 2012 4.2% Senior Notes	Feb. 29, 2012 At Films	Dec. 31, 2012 At Films	Jan. 31, 2011 At Films	Dec. 31, 2012 Matcon Group Limited	Jul. 20, 2012 Matcon Group Limited
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration paid						$ 1,500,000
Contingent consideration for acquisition included in accrued expense	3,528,000	1,500,000					1,500,000		3,528,000
Contingent consideration value as of opening balance sheet date	9,043,000	3,000,000						2,700,000	9,043,000	8,400,000
Contingent consideration for acquisition recorded in Noncurrent liabilities	5,515,000								5,515,000
Business acquisition, contingent consideration recognized to SG&A	2,700,000								600,000
Stated interest rate			2.58%	4.50%	4.20%
Fair value of our revolving facility and senior debt	806,300,000
Carrying value of our revolving facility and senior debt	$ 775,900,000