Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Examination	Dec. 31, 2011	Dec. 31, 2010
Income Tax And Carryforwards [Line Items]
Valuation allowance on state net operating loss carryforwards	$ 38,837,000	$ 29,757,000
State net operating loss carryforwards	45,929,000	36,912,000
Income tax receivables	1,500,000	3,000,000
Interest and penalties recognized as income tax expense	218,000	492,000	1,525,000
Balance of accrued interest and penalties included in liability for unrecognized income tax benefits	2,820,000	2,602,000	4,496,000
Unrecognized income tax benefits that would affect the effective tax rate if recognized	9,170,000	9,205,000	12,038,000
Number of examinations of federal tax returns	2
Deferred income taxes on undistributed earnings		56,000,000
Amount of deferred income taxes to be recognized on undistributed earnings of foreign subsidiaries		$ 19,600,000