Property and Equipment - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property Plant And Equipment [Abstract]
Depreciation expense	$ 7,100,000	$ 8,400,000	$ 20,800,000	$ 23,100,000
Net selling costs of facility and land	12,696,000		12,696,000
Gain on sale of facility and related land	$ 4,775,000		$ 4,775,000