Stockholders' Equity (Common Stock Shares Reserved for Issuances) (Detail)	Dec. 31, 2016 shares
Class Of Stock [Line Items]
Shares reserved for issuance	6,454,259
Restricted Stock Units Performance Share Units Deferred Share Units And Warrants [Member]
Class Of Stock [Line Items]
Shares reserved for issuance	1,481,645
2016 Incentive Award Plan [Member]
Class Of Stock [Line Items]
Shares reserved for issuance	4,972,614

Aggregate number of common shares reserved for future issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant