Commitments and Contingencies - Legal Matters - Additional Information (Detail)	6 Months Ended	12 Months Ended	186 Months Ended
	Jun. 30, 2017 USD ($) Case	Dec. 31, 2014 USD ($)	Jun. 30, 2017 USD ($) Case	Dec. 31, 2016 Case
Commitments And Contingencies Disclosure [Abstract]
Cumulative settlement payments for cases involving asbestos-related claims | $		$ 500,000	$ 1,200,000
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses | $			1,100,000
Average cost per settled claim excluding legal fees | $	$ 27,000		$ 27,000
Number of claims pending | Case	221		221	229
Number of new cases filed | Case	27
Number of cases dismissed | Case	30
Number of cases settled | Case	5
Settlement recovering expense | $		$ 200,000
Assessment regarding Loss contingency impact Description	We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.