Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended
	Dec. 31, 2013	Nov. 30, 2013	Mar. 31, 2014 Subsidiary
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of subsidiaries owned			8
Public Offerings of common stock		3,310,098
Common stock by certain shareholders		810,098
Public offering price per share	$ 57.00	$ 57.00
Common stock pursuant to underwriters' option	496,515
Offering expenses	$ 500,000
Proceeds from Public Offerings of common stock	163,100,000
Proceeds from sale of common stock by the selling shareholders	$ 0