Components of Contracts in Progress and Advance Billings on Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Contractors [Abstract]
Costs incurred less costs of revenue recognized	$ 65,113	$ 65,321
Revenues recognized less billings to customers	360,873	494,833
Contracts in Progress	425,986	560,154
Billings to customers less revenue recognized	466,205	394,352
Costs incurred less costs of revenue recognized	(187,276)	(152,656)
Advance Billings on Contracts	$ 278,929	$ 241,696