Revenue Earned In Excess Of Billings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	$ 11,875	$ 5,131
Time-And-Materials Projects
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	13,656	8,640
Fixed-Price Projects
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	$ (1,781)	$ (3,509)