Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Stockholders' Equity - Additional Information (Detail) - 2016 Stock Repurchase Program - USD ($)	Mar. 31, 2018	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016
Stockholders Equity [Line Items]
Stock repurchase program authorized amount		$ 300,000,000		$ 100,000,000
Stock repurchase program additional amount authorized		$ 100,000,000.0	$ 100,000,000
Available amount under repurchase program	$ 99,100,000