FAIR VALUE MEASUREMENTS - Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 43,058	$ 61,991
Short-term investments	353	413
Total assets	43,411	62,404
Liabilities:
Contingent consideration	17,482	12,527
Total liabilities	17,482	12,527
Level 1 Inputs [Member]
Assets:
Cash and cash equivalents	43,058	61,991
Short-term investments	353	413
Total assets	43,411	62,404
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 2 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Total assets	0	0
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 3 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Total assets	0	0
Liabilities:
Contingent consideration	17,482	12,527
Total liabilities	$ 17,482	$ 12,527