Commitments and Contingencies - Summary of Cases Dismissed or Judgment Entered (Detail)	6 Months Ended
	Jun. 30, 2013
Salinas [Member]
Loss Contingencies [Line Items]
Plaintiff	Salinas
Month Served	Aug-08
Jurisdiction	US District Court, ND CA
Claim Type	Wrongful Death
Status	Court granted Motion for Reconsideration and Motion for Summary Judgment
Russell [Member]
Loss Contingencies [Line Items]
Plaintiff	Russell
Month Served	Dec-11
Jurisdiction	US District Court, WD VA
Claim Type	Wrongful Death
Status	Voluntary Dismissal
Glowczenski [Member]
Loss Contingencies [Line Items]
Plaintiff	Glowczenski
Month Served	Jun-05
Jurisdiction	US Disrict Court, ED NY
Claim Type	Wrongful Death
Status	Court granted Motion for Summary Judgment
Athetis [Member]
Loss Contingencies [Line Items]
Plaintiff	Athetis
Month Served	May-09
Jurisdiction	Maricopa County Superior Court, AZ
Claim Type	Wrongful Death
Status	Voluntary Dismissal
City of Warren MI [Member]
Loss Contingencies [Line Items]
Plaintiff	City of Warren MI
Month Served	Apr-12
Jurisdiction	US District Court, ED MI
Claim Type	Third Party Complaint
Status	Dismissed
Fressadi [Member]
Loss Contingencies [Line Items]
Plaintiff	Fressadi
Month Served	Feb-13
Jurisdiction	US District Court, AZ
Claim Type	Suspect Injury During Arrest
Status	Dismissed