Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Line Items]
Accrued compensation	$ 25,828	$ 27,559
Accrued income tax and sales tax	3,812	1,820
Customer deposits	5,653	6,612
Interest payable	8,972	9,967
Accrued insurance costs	1,576	1,781
Customer claims	553	997
Provision for contract cost overruns	531	449
Other	5,791	4,638
Total	$ 52,716	$ 53,823