Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings per Share Subsequent to IPO (Parenthetical) (Detail)

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Earnings Per Share - Computation of Basic and Diluted Earnings per Share Subsequent to IPO (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Fully vested DSUs 2,276,000 2,276,000
Deferred stock units [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
DSU Settlement to Common Stock Percentage   20.00%
DSU settlement into actual stock issued term   5 years
Non-employee directors [Member] | Restricted Stock [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Restricted stock awards issued to non-employee directors, vesting term   3 years