Significant Components of Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Liabilities [Line Items]
Accrued expenses	$ 40,384	$ 40,141
Deferred revenues	34,086	29,707
Dividends payable	18,911	18,913
Accrued income taxes	9,952	5,731
Other	28,902	31,371
Total	$ 132,235	$ 125,863