Contingent Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Standby letters of credit [Member]
Line of Credit Facility [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 6.8
Bank guarantees [Member]
Line of Credit Facility [Line Items]
Loss contingency, range of possible loss, portion not accrued	4.8
Surety bonds [Member]
Line of Credit Facility [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 1.7