The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Interim Financial Statements - Additional Information (Detail) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Facility	Jun. 30, 2017 USD ($)
Interim Reporting [Line Items]
Number of manufacturing facilities \| Facility				51
Net profit change on contracts		$ (24,511)	$ (21,138)	$ (30,494)	$ (13,727)
Cash paid for debt prepayment	$ 31,600
Maximum [Member] \| Accounting Standards Update 2014-09 [Member]
Interim Reporting [Line Items]
Net profit change on contracts				$ 100