Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 05, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Restricted Stock [Member]
Non-employee directors [Member]
Dec. 31, 2013
Restricted Stock [Member]
Non-employee directors [Member]
Nov. 05, 2013
IPO [Member]
Mar. 31, 2014
IPO [Member]
Nov. 05, 2013
IPO MMI [Member]
Nov. 05, 2013
IPO Underwriters [Member]
Nov. 05, 2013
IPO Selling Stockholder [Member]
Mar. 31, 2014
Issued in IPO [Member]
Restricted Stock [Member]
Non-employee directors [Member]
Dec. 31, 2013
Issued in IPO [Member]
Restricted Stock [Member]
Non-employee directors [Member]
Stockholders Equity [Line Items]                        
IPO completion date             Nov. 05, 2013          
Common stock sold and issued under IPO           6,900,000   4,173,413 900,000 2,726,587 30,000 30,000
Common stock sold and issued under IPO, price per share           $ 12.00            
Proceeds from IPO $ 42.3                      
Underwriting discounts and commissions                 3.5      
IPO related expenses $ 4.3                      
Common stock, shares issued   36,600,897 36,600,897                  
Common stock, shares outstanding   36,600,897 36,600,897                  
Common stock share, par value   $ 0.0001 $ 0.0001                  
Restricted stock awards issued to non-employee directors, vesting term       3 years 3 years              
Preferred stock, share outstanding authorized   25,000,000 25,000,000                  
Preferred stock, par value   $ 0.0001 $ 0.0001                  
Preferred stock, shares issued   0 0                  
Preferred stock, shares outstanding   0 0