FAIR VALUE MEASUREMENTS - Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents	$ 61,991	$ 31,324
Short-term investments	413	503
Total assets	62,404	31,827
Liabilities:
Contingent consideration	12,527	18,511
Total liabilities	12,527	18,511
Level 1 Inputs [Member]
Assets:
Cash and cash equivalents	61,991	31,324
Short-term investments	413	503
Total assets	62,404	31,827
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	12,527	18,511
Total liabilities	$ 12,527	$ 18,511