Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Income Taxes [Line Items]
Pre-tax income from U.S. operations			$ 105,200,000	$ 84,700,000	$ 77,100,000
U.S. federal tax at statutory rate			35.00%	35.00%	35.00%
Stock compensation expense	5,296,000		6,022,000	5,296,000
Employee and non-employee awards			48,400,000
Net operating loss carryforwards			700,000
Net operating loss carryforwards, expiration date			2025
Additional annual limitations			50% or greater change
Percentage of change in ownership			50.00%
Additional annual limitations period			3 years
Tax benefit		4,200,000			4,237,000	11,400,000
Tax loss carryforwards		10,400,000				31,000,000
Capital loss on the sale			20,600,000
Capital loss carried back			1,200,000
Reduction in income tax provision	6,700,000
Decrease in unrecognized tax benefit reserve	3,600,000
Increase unrecognized tax benefits	3,100,000			3,100,000
Aggregate unremitted earnings	0		0	0
US Country [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards			9,300,000
Net operating loss carryforwards, expiration date			2021
Foreign Country [Member]
Schedule Of Income Taxes [Line Items]
Pre-tax income from foreign operations			$ 2,100,000	$ 4,600,000	$ 4,400,000