Commitments, Contingencies and Legal Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 28, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Contingencies And Commitments [Line Items]
Future minimum payments under the operating lease agreements, 2013		$ 34.7
Future minimum payments under the operating lease agreements, 2014		22.8
Future minimum payments under the operating lease agreements, 2015		9.2
Future minimum payments under the operating lease agreements, 2016		6.3
Future minimum payments under the operating lease agreements, 2017		4.0
Future minimum lease payments under the operating lease agreements, beyond 2017		5.5
Lease expiration date		Dec. 31, 2026
Rental expense under all operating leases		44.9	37.0	32.8
Total purchase commitments due through 2016		348.0
Company's percentage of take-or-pay agreement with SMP		51.00%
Terms in which take-or-pay agreement may be terminated by either party		Upon two years written notice
Outstanding obligation related to standby letters of credit		4.1	3.5
Period of renewal for standby letter of credit		Annually
Jury award to GE for patent infringement	$ 7.6