Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 270
Financial Guarantee One [Member]
Loss Contingencies [Line Items]
Long-term Debt, Gross	1.0
Line of Credit Facility, Current Borrowing Capacity	1.0
Debt Instrument, Term	2 years
Debt Instrument, Payment Terms	payment calculations assume a 7 year amortization with a balloon payment due at the end of the term.
Line of Credit Facility, Description	line of credit has a two year term expiring in September 2015.
Line of Credit Facility, Expiration Date	Sep. 30, 2015
Financial Guarantee Two [Member]
Loss Contingencies [Line Items]
Long-term Debt, Gross	$ 1.4
Debt Instrument, Term	2 years
Debt Instrument, Payment Terms	payment calculations assume a 7 year amortization with a balloon payment due at the end of the term.