Commitments and Contingencies - Summary of Other Litigation Matters (Detail)	12 Months Ended
	Dec. 31, 2013
Bachtel [Member]
Loss Contingencies [Line Items]
Plaintiff	Bachtel
Month Served	Aug-11
Jurisdiction	14th Judicial Circuit Court, Randolph County, MO
Claim Type	Wrongful Death
Status	Appeal fully briefed; Oral Argument held on January 14, 2014.
Glowczenski [Member]
Loss Contingencies [Line Items]
Plaintiff	Glowczenski
Month Served	Oct-04
Jurisdiction	US District Court, ED NY
Claim Type	Wrongful Death
Status	Notice of Appeal filed September 2013; Opening Brief was filed January 2014; Answering Brief is due April 2014.