Share-Based Compensation - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Installments
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of forfeited restricted stock units | $	$ 0.9
PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments that stock units will vest in installment	3
PRSUs [Member] | Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of PRSUs vesting on third anniversary	50.00%
Percentage of PRSUs vesting on fourth anniversary	50.00%
PRSUs [Member] | Executive Officers [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage multiplier to determine number of shares to be awarded in connection with vesting of PRSUs	0.00%
PRSUs [Member] | Executive Officers [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage multiplier to determine number of shares to be awarded in connection with vesting of PRSUs	200.00%
Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments that stock units will vest in installment	4
Time Based Restricted Stock Units [Member] | Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments that stock units will vest in installment	3
Time Based Restricted Stock Units [Member] | Non Officer Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments that stock units will vest in installment	3