Annual report pursuant to Section 13 and 15(d)

Investments and Fair Value Measurements - Additional Information (Detail)

v2.4.1.9
Investments and Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Investments $ 1,307us-gaap_EquityMethodInvestments $ 103us-gaap_EquityMethodInvestments
Maximum financial interest in affiliated investment funds 2.00%us-gaap_EquityMethodInvestmentOwnershipPercentage