Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Autocam [Member]	Aug. 29, 2014 Autocam [Member]	Sep. 30, 2014 Other Acquisitions [Member]	Jun. 30, 2014 Other Acquisitions [Member]	Sep. 30, 2014 Other Acquisitions [Member] Third Quarter [Member]	Sep. 30, 2014 Other Acquisitions [Member] Adjustments to Fair Value [Member]
Business Acquisition [Line Items]
Current assets				$ 88,529	$ 5,688	$ 5,347	$ 397	$ (56)
Property, plant, and equipment				146,120	15,367	14,750	274	343
Intangible assets subject to amortization				51,098	2,705	1,815	1,140	(250)
Investment in joint venture	33,348			35,595
Other non-current assets				2,170
Goodwill	87,687	8,624		77,548	2,038	732	1,428	(122)
Total assets acquired	20,995			401,060	25,798	22,644	3,239	(85)
Current liabilities				34,320	4,803	4,749	139	(85)
Current maturities of long-term debt				6,547
Non-current deferred tax liabilities				46,998
Obligations under capital lease			17,696	18,350
Long-term debt, net of current portion				4,263
Other non-current assets				2,028
Total liabilities assumed				112,506	4,803	4,749	139	(85)
Net asset acquired				$ 288,554	$ 20,995	$ 17,895	$ 3,100