Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended
	May 14, 2013	Sep. 30, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Stock split ratio	2
Percentage of stock dividend	100.00%
Shares issued during stock split	66,200,000
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Unbilled accounts receivable		$ 240,178,000	$ 205,045,000
Customer deposits		74,901,000	66,573,000
Provisions for loss contracts		7,400,000	14,000,000
Deferred pre-production costs		19,200,000	19,200,000
Interest rate swap agreement, Current Liability		2,389,000	3,005,000
Forward Starting Interest Rate Swap Agreement
Summary Of Significant Accounting Policies [Line Items]
Interest rate swap agreements, notional amount		150,000,000
Interest rate swap agreement, Current Liability		2,389,000	3,005,000
Interest rate swap, accumulated other comprehensive loss		$ (1,400,000)