Details of Certain Balance Sheet Accounts - Other Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Details Of Certain Balance Sheet Accounts [Abstract]
Workers compensation deposits	$ 200,000	$ 500,000
Health insurance deposits	1,200,000	1,200,000
Other miscellaneous deposit	900,000	1,100,000
Deferred financing fees	2,200,000	2,500,000
Investments	16,900,000	8,900,000
Other noncurrent assets	4,900,000	4,500,000
Other assets, net	$ 26,283,000	$ 18,650,000