Annual report pursuant to Section 13 and 15(d)

Common and Preferred Stock - Additional Information (Detail)

v2.4.1.9
Common and Preferred Stock - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]    
Common stock held by management   51.9us-gaap_TemporaryEquitySharesOutstanding
Preferred stock, shares authorized 5,000us-gaap_PreferredStockSharesAuthorized 5,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Put Options [Member]    
Class of Stock [Line Items]    
Common stock held by management   161us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_PutOptionMember
Fair value adjusted to common stock   16,975us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_PutOptionMember