Accounts Receivable - Contract Receivables (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Retainages	$ 14,954	$ 28,586
Accounts receivable – trade, net	287,264	143,370
Contract receivables [Member]
Accounts Notes And Loans Receivable [Line Items]
Unbilled	4,303	4,303
Less allowances	(25,798)	(30,391)
Accounts receivable – trade, net	287,264	143,370
Contract receivables [Member] | Contracts in progress [Member]
Accounts Notes And Loans Receivable [Line Items]
Contracts receivable	277,871	106,174
Contract receivables [Member] | Completed contracts [Member]
Accounts Notes And Loans Receivable [Line Items]
Contracts receivable	$ 15,934	$ 34,698