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Stock-Based Compensation - Schedule of Restricted Stock Unit Programs Outstanding (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity Classified RSUs [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning Balance 605,430 367,726 181,732
Granted 224,841 320,131 208,458
Dividend equivalents 1,262 1,895 2,022
Redeemed (199,679) (84,322) (24,486)
Number of options outstanding, Ending Balance 631,854 605,430 367,726
Liability Classified RSUs [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning Balance 20,099 29,806 34,242
Granted 13,825 15,364 4,150
Dividend equivalents 624 1,133 946
Redeemed (4,429) (26,204) (9,532)
Number of options outstanding, Ending Balance 30,119 20,099 29,806
Liability Classified DSUs [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning Balance 206,923 198,446 186,348
Granted 30,716 37,456 22,669
Dividend equivalents 2,815 5,145 4,696
Redeemed (113,007) (34,124) (15,267)
Number of options outstanding, Ending Balance 127,447 206,923 198,446
Release of Restricted Stock Units [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning Balance 832,452 595,978 402,322
Granted 269,382 372,951 235,277
Dividend equivalents 4,701 8,173 7,664
Redeemed (317,115) (144,650) (49,285)
Number of options outstanding, Ending Balance 789,420 832,452 595,978