Business Combinations - Schedule of Fair Values of the Assets Acquired and the Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jan. 03, 2017	Jun. 30, 2017
Liabilities assumed:
Goodwill		$ 43,766
Grohmann Engineering GmbH [Member]
Assets acquired:
Cash and cash equivalents	$ 334
Accounts receivable	42,947
Inventory	10,031
Property, plant and equipment	44,030
Intangible assets	21,723
Prepaid expenses and other assets, current and non-current	1,998
Total assets acquired	121,063
Liabilities assumed:
Accounts payable	(19,975)
Accrued liabilities	(12,403)
Debt and capital leases, current and non-current	(9,220)
Other long-term liabilities	(10,049)
Total liabilities assumed	(51,647)
Net assets acquired	69,416
Goodwill	40,065
Total purchase price	$ 109,481