Commitments and Contingencies - Additional Information (Detail)		9 Months Ended
	Mar. 10, 2015 USD ($)	Sep. 30, 2015 USD ($) site Operable_Unit Payments	Jun. 01, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies [Line Items]
Letters of credit contingently liable		$ 456,000		$ 473,000
Number of operable units | Operable_Unit		2
Treatment of impacted soils completed, percentage		70.00%
State of NJ total claim for past and future cleanup costs		$ 1,300,000
State of NJ total claim for natural resource damages		500,000
State of NJ total claim for certain costs		1,800,000
Company offer to resolve State of NJ claim accrued		250,000
Total environmental accruals		10,798,000		16,859,000
Environmental accrual, long-term portion		3,724,000		7,384,000
Pennsauken Site (OU-1 and OU-2) [Member]
Commitments And Contingencies [Line Items]
Payment for past cost as per agreement installment amount		2,141,000
Payment for past cost as per agreement aggregate amount		$ 10,705,000
Number of equal payments | Payments		5
Payment related to obligation including interest			$ 6,569,000
Description of payment period		The fourth and fifth payments will be made on the anniversary of the prior year's payment plus ten days
Compass Directional Guidance Inc [Member]
Commitments And Contingencies [Line Items]
Damages sought, value	$ 18,000,000
Filed complaint, trial date		2016-04
Financial Assurance [Member]
Commitments And Contingencies [Line Items]
Letters of credit contingently liable		$ 4,282,000		$ 6,423,000
SurfTech [Member]
Commitments And Contingencies [Line Items]
Number of sites | site		3
Number of sites owned by the Company | site		2