Retirement Plans - Additional Information (Detail)	3 Months Ended
Mar. 31, 2017
Retirement Plans Disclosure [Abstract]
Percent of employer match	100.00%
Employee contribution percentage	6.00%
Additional discretionary contribution, annual financial goals, percentage	3.00%

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration