Annual report pursuant to Section 13 and 15(d)

Other Assets - Additional Information (Detail)

v3.19.1
Other Assets - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]  
Period of not utilizing deferred share issuance costs and prepaid amounts related to insurance 12 months