Noncontrolling Interest Subject to Put Provisions - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013 iThink [Member]	Sep. 30, 2013 iThink [Member]	Jan. 16, 2013 iThink [Member]
Noncontrolling Interest [Line Items]
Acquisition of membership interests		84.00%	81.00%	81.00%
Company's potential obligations under put options	$ 700,000
Company's potential obligations under exercisable	$ 0