Discontinued Operations - Summary of Accounting Transactions that Resulted in a Loss on Disposal of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Fair value of consideration received
Fair value of the promissory note	$ 3,941
Cash payment	521
Carrying amount of the noncontrolling interest	3,476
Total fair value of consideration received and carrying amount of noncontrolling interest	7,938
Less: The carrying amount of the former subsidiary's assets and liabilities	8,684
Total loss on disposal of discontinued operations	$ (746)