Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Jan. 30, 2014 VS [Member]
Business Acquisition [Line Items]
Current assets			$ 1,263
Property, plant, and equipment			6,902
Intangible assets subject to amortization			75
Goodwill	8,959	8,624	244
Total assets acquired			8,484
Current liabilities			2,904
Total liabilities assumed			2,904
Net asset acquired			$ 5,580