Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)

v2.4.0.8
Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Fully vested DSUs 2,276,000 2,276,000
Restricted Stock [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Restricted common stock issued, vesting period   3 years
Restricted Stock [Member] | Non-employee directors [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Restricted common stock issued, vesting period   3 years
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