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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member]
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Number of SEUs, Beginning balance | shares 286,563
Granted at discount, Number of SEUs | shares 69,280
Granted at market value, Number of SEUs | shares 7,552
Exercised, Number of SEUs | shares (93,840)
Forfeited, Number of Options | shares (1,495)
Outstanding, Number of SEUs, Ending balance | shares 268,060
Outstanding, Weighted Average Exercise Price, Beginning balance $ 3.41
Granted at discount, Weighted Average Exercise Price 0.00
Granted at market value, Weighted Average Exercise Price 43.95
Exercised, Weighted Average Exercise Price 2.01
Forfeited, Weighted Average Exercise Price 29.56
Outstanding, Weighted Average Exercise Price, Ending balance 4.01
Granted at discount, Weighted Average Grant-Date Fair Value 36.65
Granted at market value, Weighted Average Grant-Date Fair Value $ 9.89