Summary of Significant Accounting Policies - Effect of Correction on Combined Financial Statements (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Deferred costs, net	$ 1,752,344	$ 790,019
Formation transaction expenses	133,112	174,235
Net income	1,967,456	3,287,105
Net cash provided by operating activities	3,518,868	5,351,665
Net cash used in financing activities	4,819,962	101,055
Net change in cash and cash equivalents	995,575	811,872
As reported [Member]
Deferred costs, net		1,003,519
Owners' equity (deficit)		(4,642,480)
Net income		3,461,340
Net cash provided by operating activities		5,525,900
Net cash used in financing activities		(73,180)
Net change in cash and cash equivalents		811,872
Adjustment [Member]
Deferred costs, net		(213,500)
Owners' equity (deficit)		(21,350)
Formation transaction expenses		174,235
Net income		(174,235)
Net cash provided by operating activities		(174,235)
Net cash used in financing activities		174,235
As adjusted [Member]
Deferred costs, net		790,019
Owners' equity (deficit)		(4,855,980)
Formation transaction expenses		174,235
Net income		3,287,105
Net cash provided by operating activities		5,351,665
Net cash used in financing activities		101,055
Net change in cash and cash equivalents		$ 811,872