Revenue Earned In Excess Of Billings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	$ 22,275	$ 11,875
Time-And-Materials Projects
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	12,708	13,656
Fixed-Price Projects
Revenue Earned in Excess of Billings [Line Items]
Revenue earned in excess of billings	$ 9,567	$ (1,781)