Investments - Components of Company's Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total	$ 14,739	$ 13,848
U.S. non-qualified deferred compensation plan [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total	14,112	13,232
Warrants and equity securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total	$ 627	$ 616