Derivative Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 42,525,000
Derivative, fair value	1,138,000
Derivative, description of hedged item	We had a net investment hedge on one Canadian dollar-denominated subsidiary which consisted of two Canadian dollar forward contracts.
Foreign Currency Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	42,525,000
Derivative, fair value	1,138,000
Foreign Currency Contracts [Member] | Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	42,500,000
Derivative, fair value	$ 1,100,000