Significant Components of Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Liabilities [Line Items]
Accrued expenses	$ 38,154	$ 40,141
Deferred revenues	29,603	29,707
Accrued income taxes	24,414	5,731
Dividends payable	18,890	18,913
Other	27,673	31,371
Total	$ 138,734	$ 125,863