Commitments and Contingencies - Additional Information (Detail) - USD ($)		3 Months Ended
	Jul. 15, 2009	Jun. 30, 2015	Mar. 31, 2013	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Other Commitments [Line Items]
Guarantees indemnifications				$ 5,822,000
Collateral/counter-guarantees				$ 5,473,000
Aggregate fair value of consideration recognized by the company at acquisition date	$ 61,624,000
Initial and Earnout shares issuable on contingent basis				913,722	913,722
Initial and Earnout shares earned				1,371,992	1,371,992
Initial and Earnout shares became settled				1,371,992	1,371,992
LFB [Member]
Other Commitments [Line Items]
Underwriting commitments				$ 0
LFNY [Member]
Other Commitments [Line Items]
Underwriting commitments				$ 0
Class A Common Stock [Member]
Other Commitments [Line Items]
Common stock issuable on non-contingent basis						170,988
Common stock issued on non-contingent basis			170,988
Issuance of common stock		27,316
Class A Common Stock [Member] | Initial Shares [Member]
Other Commitments [Line Items]
Class A common stock issued in acquisition	1,142,857
Class A Common Stock [Member] | Earnout Shares [Member]
Other Commitments [Line Items]
Additional shares of Class A common stock subject to earnout criteria and payable over time	1,142,857